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 % ?  Pick.
A) 10
B) 15
C) 12
D) 18
E) 20
let the market price of each pen be $1   then, Cost Price of 40 pens = $ 36 Selling Price of 40 pens =99% of $40=$ 39.60   profit %=((3.60*100)/36)= 
<gadget id="calculator">((3.60*100)/36)</gadget>
<output>10</output>
10%   10nswer 10)10
<result>A</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 % ?