Aptitude question:-

 As the price of a book is reduced by 20 % , then its consumption is increased by 25% . How much percentage difference is there in the previous income.?

A) 10                 

B) 20

C) 25

D) 0

Ans-

        Let us assume initially the price of book be Rs.100 and 100 be the consumption

Then , income         = 100 x 100

                               =  10000                                -------------------- (1)         

Now, if the price of book reduces 20 % then it becomes Rs. 80 and its consumption increased by 25%

so the consumption = 125

                          income   = 80 x 125

                                        = 10000                       ---------------------- (2)

from (1) and (2)

 There will be no difference in both incomes. 

Ans is Option D