Question

a dealer buys two pens for RS 30 and RS 20, and sells them at a profit of 10% and 15% respectively. Find the profit per cent.

Answer 1

Total CP = Rs 30 + Rs 20 = Rs 50

Total profit % = 10% + 15% = 25%

SP = 100 + 25/100 × 50
SP = Rs 62.5

Gain = SP - CP = 62.5 - 50 = 12.5

Gain% = 12.5×100/50 = 25%

Answer 2

first pen sell = 10% profit
so , 30×10/100 = 30 × 1/10 = RS 3 is profit of first pen
second pen sell = 15%profit
so , 20×15/100 = 15/5 = Rs 3 is profit on second pen
whole profit = 3+3=6
whole c.p = 30+20=50
profit percentage = 6/50×100 = 6×2=12% ans.