A retailer buys 40 pens at the marked price of 35 pens from a wholesaler. If he sells these pens giving a discount of 1%, what is the profit percent?

A. 12 %
B. 10 %
C. 15 %
D. 16 %
Ans: B

Explanation:

Let the marked price of each pen be Re. 1.
Then, C.P. of 40 pens = Rs. 36. S.P. of 40 pens = 99% of Rs. 40
                                                = Rs. 39.60.
=> Profit% = [3.60/36 * 100]%

                  = 10%.