Question

The cost price of 15 books is equal to the selling price of 12 books. Find the gain or loss percent.​

Answer 1

Let the C.P of 1 book be Rs.1

C.P of 12 books =Rs.12

C.P of 15 books=Rs.15

According to question

C.P of 15 books=S.P of 12 books=Rs.15

Now, C.P of 12 books=Rs.12

S.P of 12 books=Rs.15

Gain%=S.P-C.P/C.P×100

= 15-12/12×100

=3/12×100

=25%

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