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Question

44% of a number is 2288. What will be 87% of the number?

The correct answer is

4524

Let's break down this math problem to find the answer. We are given a percentage of a number and its corresponding value, and we need to find a different percentage of the same number.

Understanding the Problem

The core of the problem is to first find the original number and then calculate a percentage of that original number. We know that 44% of a certain number is equal to 2288.

Step-by-Step Solution for Percentage Calculation

Here’s how we can solve this percentage problem:

  1. Find the original number:

    Let the unknown number be \(x\). We are told that 44% of \(x\) is 2288.

    In mathematical terms, this can be written as:

    \(\text{44\% of } x = 2288\)

    To work with percentages in calculations, we convert the percentage to a decimal or a fraction.

    \(\text{44\%} = \frac{44}{100} = 0.44\)

    So, the equation becomes:

    \(0.44 \times x = 2288\)

    To find \(x\), we need to divide 2288 by 0.44:

    \(x = \frac{2288}{0.44}\)

    Let's perform the division:

    \(x = 5200\)

    So, the original number is 5200.

  2. Calculate 87% of the original number:

    Now that we know the original number is 5200, we need to find 87% of this number.

    Convert 87% to a decimal or fraction:

    \(\text{87\%} = \frac{87}{100} = 0.87\)

    Now, multiply the original number by 0.87:

    \(87\% \text{ of } 5200 = 0.87 \times 5200\)

    Let's calculate the product:

    \(0.87 \times 5200 = 4524\)

    So, 87% of the number is 4524.

The final answer is 4524.

Summary of Calculation

Description Calculation Result
Given: 44% of Number \(0.44 \times \text{Number}\) 2288
Find the Number \(\text{Number} = \frac{2288}{0.44}\) 5200
Calculate 87% of Number \(0.87 \times 5200\) 4524

Revision Table: Key Concepts in Percentage Problems

Concept Explanation Formula/Example
Percentage A way of expressing a fraction of 100. Represented by the symbol %. \(\text{p\%} = \frac{p}{100}\)
Finding Percentage of a Quantity To find p% of a quantity Q, multiply Q by \(\frac{p}{100}\) or \(0.01p\). p% of Q = \(\frac{p}{100} \times Q\)
Finding the Original Quantity If p% of a quantity X is Y, then \(X = \frac{Y}{p\%} = \frac{Y}{p/100} = \frac{Y \times 100}{p}\). If 44% of \(x\) is 2288, \(x = \frac{2288 \times 100}{44}\)

Additional Information: Solving Percentage Word Problems

Percentage word problems are common in various exams and real-life situations. Here are some tips for solving them effectively:

  • Always identify what the known percentage represents and what value corresponds to it.
  • Determine what you need to find (the original number, a part of the number, the percentage change, etc.).
  • Set up an equation based on the information given. Using a variable (like \(x\)) for the unknown number can be helpful.
  • Convert percentages to decimals or fractions before performing calculations. Decimals are often easier for multiplication and division.
  • Double-check your calculations, especially division and multiplication with decimals.
  • Ensure your final answer makes sense in the context of the problem. For instance, if you're calculating a larger percentage, the result should be a larger number than the value given for a smaller percentage (assuming the original number is positive). In this case, 87% should be greater than 44%, and 4524 is indeed greater than 2288.
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Important Questions from Percentage

  1. What should be subtracted from 20% of 450 to get 25% of 240?

  2. What percent of 3 minutes is 15 seconds?

  3. A certain sum becomes 36/25 of itself after 2 years on compound interest. Find the rate of interest per annum.

  4. A student has to obtain 33% of the total marks to pass an examination. He got 148 marks and failed by 50 marks. The maximum marks of the examination are:

  5. $5\%$ of $4.20$ is

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