Question

If the selling price of 10 pens is the same as the cost price of 12 pens then gain percent is

1. 2%
2. 12%
3. 20%
4. 25%

Answer 1

(3) 20%

let us consider the CP as x

SP of 1 pen = x/10

CP of 1 pen = x/12

Since SP is more than CP its Gain

Gain = SP – CP

= x/10 – x/12

= x/60

∴ Gain% = (Gain × 100) /CP

= ((x/60) × 100) / (x/12)

= 20%