Aashu sold a book at 5 loss and a Pencil at 15 profit In the whole business he earned Rs 7 If he had...........

Quantitative Aptitude (CGL) Number System

Aashu sold a book at 5% loss and a Pencil at 15% profit. In the whole business he earned Rs.7. If he had sold a book at 5% profit and a pencil at 10% profit then he has earned Rs.6 more. What is the cost price of a book and a pencil?

200

150

100

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Explanation:

C.P. of book= x, C.P. of pencil= y
y×15% - x×5% = 7 ......(1)
y×10% + x×5% = 6+7 ......(2)
(1) + (2)
y×25% = 20 Rs.
y = 80 Rs.
Putting y=80 in equ. (1)
80×15% - x×5% = 7
x = 100 Rs.

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