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Question 1
The number of online customers increased from 625 to 2075. What is the percentage increase?
Question 2
A clerk multiplied a number by 5/4 instead of 4/5. What is the percentage of error?
Question 3
If 57 is m% of p, and B is p% of m, then what is B?
Question 4
Mr. X who spends 62% of his salary is able to save Rs. 342. What is his salary?
Question 5
A number is first increased by 40%. By what percent must it be reduced so as to restore it to its previous value?
$28{4/7}$ %.
$34{1/2}$ %.
$21{4/9}$ %.
$24{5/9}$ %.
Ans: a
Let us derive the shortcut formula first, so that you can remember it and use it when the need arises. Suppose the number is 100, and let the increase be x%. The number becomes 100 + x. Let us suppose that it has to be reduced by p% to restore it to 100. Then, (100 + x) - p × $(100 + x)/100$ = 100. We can cancel away 100, and easily simplify it to p = ${100 × x}/{100 + x}$ = ${100 × 40}/{100 + 40}$ = ${200/7}$, which is same as: $28{4/7}$%.
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This Blog Post/Article "Percentages Quiz Set 013" by Parveen (Hoven) is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Updated on 2020-02-07. Published on: 2016-05-12