Question

the selling price of 12 pens is equal to the cost price of 13 pencils find the gain or loss percent ​

Answer 1

Answer:

Let the CP of each pen be Rs.x.

Then,

CP of 12 pens=Rs.12

SP of 12 pens=CP of 15 pnes=Rs.15

now,gain=SP-CP=Rs.(15-12)=Rs.3

gain%=gain/cp*100

        =(3/12*100)%=25%

Hence,the gain=25%.

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Answer 2

Answer:

Hence,the gain=25%.

Step-by-step explanation:

Let the C.P. of 1 pen =Re. 1

∴ C.P of 12 pens=Rs. 12×1

=Rs. 12

Hence, given

C.P. of 12 pens = S.P of 16 pens

∴ S.P of 16 pens=Rs. 12

∴ C.P of 16 pens=Rs. 16

∴ Loss=C.P−S.P

=16−12

=4 Rs.

Loss %=C.PLoss×100

=164×100

=25%.