A bookseller sold a book for Rs. 60/- to make a profit of 20%. In order to earn a profit of 10%, he should have sold it for:

A. 55
B. 50
C. 65.5
D. 70

Answer

Correct Answer: A. 55


Solution

Given Formula

SP = Sale price

CP = Cost price

SP = [(100 + Gain%) / 100] x CP

60 = [ ( 100+20 ) /100 ] x CP

⇒ CP = 50

To earn 10% profit, use

SP = [(100 + Gain%) / 100] x CP

SP = [ (100 +10 )/100] x 50

by solving this

SP = 55

What will be the cost of building a fence around a square plot with area equal to 289 sq ft, if the price per foot of building the fence is Rs. 58?

A. Rs. 3154
B. Rs. 3748
C. Rs. 3847
D. Rs. 3944

Answer

Correct Answer: D. Rs. 3944


Solution

Let the side of the square plot be ‘a’ ft.
Given area of the plot (a x a) = 289 => a = 17
Length of the fence = Perimeter of the plot = 4a = 68 ft.
Cost of building the fence = 68 x 58 = Rs. 3944.

The average monthly salary of 24 employees in an organisation is Rs. 1500. If the manager’s salary is added, then the average salary increases by Rs. 400. What is the manager’s monthly salary?

A. Rs. 8840
B. Rs. 9450
C. Rs. 11,500
D. Rs. 12,800

Answer

Correct Answer: C. Rs. 11,500


Solution

Manager’s monthly salary

= Rs. (1900 x 25 – 1500 x 24) = Rs. 11,500

The average weight of a group of boys is 30 kg. After a boy of weight 35 kg joins the group, the average weight of the group goes up by 1 kg. Find the number of boys in the group originally?

A. 4
B. 6
C. 7
D. 9

Answer

Correct Answer: A. 4


Solution

Let the number of boys in the group originally be x.
Total weight of the boys = 30x
After the boy weighing 35 kg joins the group, total weight of boys = 30x + 35
So 30x + 35 + 31(x + 1) = > x = 4.

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