Percentages Quiz Set 011 | Maths Aptitude Quiz Questions and Mock Test on Percentages Set 11 | mock tests for Bank PO, SSC Exams, SO Clerical Exam, GATE Exam, LIC AO, GIC AO, etc.

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Question 1

The number of online customers increased from 1825 to 2875. What is the percentage increase?

$57{39/73}$ %.

$59{25/72}$ %.

$55{2/75}$ %.

$58{23/25}$ %.

Soln.
Ans: a

The increase is 2875 - 1825 = 1050. The percentage increase is $1050/1825$ × 100 = ${4200/73}$, which is same as: $57{39/73}$.

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Question 2

If 4% of A + B = 9% of A - B, then what percent of B is A?

$2{3/5}$ %.

$4{1/2}$ %.

$1{1/7}$ %.

4 %.

Soln.
Ans: a

We have been given 4% of A + B = 9% of A - B, so ${A + B}/{A - B}$ = $9/4$. By componendo and dividendo, ${(A + B) + (A - B)}/{(A + B) - (A - B)}$ = ${9 + 4}/{9 - 4}$, which gives $A/B$ = $13/5$ = ${13/5}$, which is same as: $2{3/5}$%

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Question 3

The service tax is 5%. A person receives a telephone bill amounting to Rs. 630. How much was the bill excluding tax?

Rs. 600.

Rs. 610.

Rs. 590.

Rs. 620.

Soln.
Ans: a

Let the calls be for Rs. x. The total bill is x + 5% of x = ${21x}/20 = 630$, which gives x = Rs. 600.

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Question 4

A shopkeeper sells 56% items of his stock and still has 748 items left with him. How many items did he have at the beginning?

1700 items.

1800 items.

1600 items.

1900 items.

Soln.
Ans: a

Let the items be x. His % stock left is 100 - 56 = 44, so 44% of x = 748, which gives x = $748/44$ × 100 = 1700 items.

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Question 5

A clerk multiplied a number by 2/1 instead of 1/2. What is the percentage of error?

75 %.

77 %.

73 %.

79 %.

Soln.
Ans: a

If the actual figure is x, the error is ${2x}/1$ - ${1x}/2$ = ${2^2x - 1^2x}/{2 × 1}$ = ${3x}/2$, so %-error = ${(3x)/2}/{(2x)/1}$ × 100 = ${3 × 1}/{2 × 2}$ × 100 = 75%.

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