Question

ramu bought pens at Rs 120 a dozen.He sold it for Rs 15 each. what is his profit per cent

Answer 1

The cost of 12 pen= 120
The cost of one pen= 12/120=10
The cost of 15 pen= 15×10 = 150
Rs.150 is answer

Answer 2

C.P for 12 pens = Rs 120
S.P for 1 pen = Rs 15
S.P for 12 pens = Rs 15 × 12
= Rs 180


his profit = S.P - C.P
= Rs 60

profit % = 60 \ 120 × 100 %
= 50 %

Hope it helps !!!!!