Question

The selling price of 12pens is equal to the cost price of 15pens. find the gain per cent​

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%.

Answer 2

Gain percent = (Difference/Number of pens sold) * 100 = (15-12)/12 * 100

= 3/12 * 100 = 300/12 = 25%