Question

Pens are bought at 15 for a rupee and sold at 12 for a rupee. Find the gain or loss% .

Answer 1

there is a loss of 3 RS
%of loss = 3/15*100=20%

Answer 2

There will be profit
That is SP of 3 pens
Profit%=profit/CP×100
3/15×100
20% of profit.