The Price Reduction of a Computer

Oct 13, 2025 by windailys.com 129 views

Introduction

In this article, we will delve into a mathematical problem involving the initial freshman class at a college. The problem states that the initial freshman class is $10 \%$ smaller than last year's class, and during the first week of classes, 20 more students enroll, resulting in 830 students in the freshman class. We will use mathematical concepts and formulas to analyze and solve this problem.

Problem Statement

Let's break down the problem statement:

The initial freshman class is $10 \%$ smaller than last year's class.
During the first week of classes, 20 more students enroll.
The resulting freshman class has 830 students.

Mathematical Formulation

Let's denote the number of students in last year's class as $x$ . Since the initial freshman class is $10 \%$ smaller than last year's class, the number of students in the initial freshman class is $0.9x$ .

During the first week of classes, 20 more students enroll, resulting in a total of 830 students in the freshman class. We can set up an equation to represent this situation:

0.9x + 20 = 830

Solving the Equation

To solve for $x$ , we can start by subtracting 20 from both sides of the equation:

0.9x = 810

Next, we can divide both sides of the equation by 0.9 to isolate $x$ :

x = \frac{810}{0.9}

x = 900

Analysis and Conclusion

So, the number of students in last year's class was 900. This means that the initial freshman class was $10 \%$ smaller than last year's class, with 810 students.

During the first week of classes, 20 more students enrolled, resulting in a total of 830 students in the freshman class. This represents an increase of 20 students, or approximately 2.5% of the initial freshman class.

The Price Reduction of a Computer

A store reduces the price of a computer by $20 \%$ and then offers a $10 \%$ discount on the reduced price. By what percentage is the final price of the computer less than the original price?

Mathematical Formulation

Let's denote the original price of the computer as $x$ . The store reduces the price by $20 \%$ , resulting in a new price of $0.8x$ .

The store then offers a $10 \%$ discount on the reduced price, resulting in a final price of $0.9(0.8x)$ .

Solving the Problem

To find the percentage by which the final price is less than the original price, we can calculate the difference between the original price and the final price, and then divide by the original price:

\frac{(x - 0.9(0.8x))}{x} \times 100\%

\frac{(x - 0.72x)}{x} \times 100\%

\frac{0.28x}{x} \times 100\%

28\%

Conclusion

In this article, we analyzed a mathematical problem involving the initial freshman class at a college. We used mathematical concepts and formulas to solve the problem and found that the number of students in last year's class was 900. We also solved a problem involving the price reduction of a computer and found that the final price is 28% less than the original price.

Mathematical Concepts

This article covers the following mathematical concepts:

Percentages
Discounts
Equations
Algebra

Real-World Applications

This article has real-world applications in the following areas:

Education: The problem involving the initial freshman class at a college is relevant to educators and administrators who need to plan for student enrollment and resources.
Business: The problem involving the price reduction of a computer is relevant to business owners and managers who need to make pricing decisions and offer discounts to customers.

Conclusion

Introduction

In our previous article, we analyzed a mathematical problem involving the initial freshman class at a college. We used mathematical concepts and formulas to solve the problem and found that the number of students in last year's class was 900. We also solved a problem involving the price reduction of a computer and found that the final price is 28% less than the original price.

In this article, we will provide a Q&A section to further clarify the concepts and solutions presented in our previous article.

Q&A

Q: What is the difference between the initial freshman class and last year's class? A: The initial freshman class is $10 \%$ smaller than last year's class, which means that the number of students in the initial freshman class is $0.9x$ , where $x$ is the number of students in last year's class.

Q: How many students were in last year's class? A: According to our previous article, the number of students in last year's class was 900.

Q: What is the final price of the computer after the price reduction and discount? A: The final price of the computer is $0.9(0.8x)$ , where $x$ is the original price of the computer.

Q: By what percentage is the final price of the computer less than the original price? A: The final price of the computer is 28% less than the original price.

Q: What is the formula for calculating the percentage by which the final price is less than the original price? A: The formula is $\frac{(x - 0.9(0.8x))}{x} \times 100\%$ , where $x$ is the original price of the computer.

Q: What are some real-world applications of the mathematical concepts presented in this article? A: The mathematical concepts presented in this article have real-world applications in education and business. For example, educators and administrators can use these concepts to plan for student enrollment and resources, while business owners and managers can use these concepts to make pricing decisions and offer discounts to customers.

Q: What are some common mistakes to avoid when working with percentages and discounts? A: Some common mistakes to avoid when working with percentages and discounts include:

Not accounting for the order of operations when calculating percentages and discounts
Not using the correct formula for calculating percentages and discounts
Not considering the impact of compounding when working with multiple discounts or promotions

Conclusion

In conclusion, this article provides a Q&A section to further clarify the concepts and solutions presented in our previous article. We hope that this article has been helpful in providing a better understanding of the mathematical concepts and real-world applications presented in our previous article.

Mathematical Concepts

This article covers the following mathematical concepts:

Percentages
Discounts
Equations
Algebra
Order of operations
Compounding

Real-World Applications

This article has real-world applications in the following areas:

Education: The mathematical concepts presented in this article have real-world applications in education, including planning for student enrollment and resources.
Business: The mathematical concepts presented in this article have real-world applications in business, including making pricing decisions and offering discounts to customers.