A whole seller gives 40 pens to a retailer at Maximum retail price of 36 pens. The retailer sold pens after giving 1% discount to his customer Find profit % of the retailer during the whole transaction.

10%

Let price of 1 pen = Rs. 1

Cost price of 40 pens (in retailer's hand) = Rs. 36

SP of 40 pens = 40 × 99% = 39.6

Profit % = \(\frac{(39.6 - 36)}{36}\) × 100

            = \(\frac{3.6}{36}\) × 100 = 10%