Question

By selling a pen for Rs. 18, there is a gain of 20 %. Find the C.P.​

Answer 1

Answer:

CP of 18 pen = SP of 12 pen

Formula used:

Gain% = (Gain × 100)/CP

Gain = SP – CP

Calculation:

Let SP of 1 pen be Re 1

So, SP of 18 pens = Rs. 18

CP of 18 pens = SP of 12 pens = Rs. 12

Gain = 18 – 12 = Rs. 6

Gain % = (6/12) × 100) = 50%

∴ The Gain% is 50%

CP of 18 pen = SP of 12 pen

CP/SP = 12/18 = 2/3

Gain% = {(3 – 2) × 100}/2 = 50%

∴ The Gain% is 50%