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

Aptitude question :

The percentage profit earned by selling an item for Rs.2120 is same as the percentage loss incurred by selling the same item for Rs.1480. At what price should the item be sold to get 20% profit.

Ans :

   

   we know that ,

                               Gain% =

                                              

      &

                               Loss %= 

                                             

  According to given condition gain for SP 2120 is same as loss for 1480

 

              

Now , we want SP on which we will get 20 % profit.

       = CP x 20%  =

      

So, SP = 1800+ 360 = 2160 .

 If we sold item for Rs 2160 ,we will get profit of 20 %.