Question

the selling price of 12 pens is equal to the cost price price of 15 pens. find gain percent
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Answer 1

Let the cost price of 15 pens be = x

So, CP of 1 pen = x/15

Cost Price of 12 pens = (x/15) 12 = 4x/5

Selling Price of 12 Pens = x

Profit = x - 4x/5 = x/5

(x/5)

Profit % = -------- × 100 = 25%

(4x/5)