A retailer buys 40 pens at the market price of 36 pens from a wholesaler, if he sells these pens giving a discount of 1% ,what is the profit % ?	Choose the correct choice from the following.
A) 5
B) 10
C) 15
D) 20
E) None of them
let the market price of each pen be Rs 1   then,C.P of 40 pens = Rs 36 S.P of 40 pens =99% of Rs 40=Rs 39.60   profit %=((3.60*100)/36)= 
<gadget id="calculator">((3.60*100)/36)</gadget>
<output>10</output>
10%   Answer is 10.
<result>B</result>
A retailer buys 40 pens at the market price of 36 pens from a wholesaler, if he sells these pens giving a discount of 1% ,what is the profit % ?