If the cost price is 90% of the selling price, then what is the profit percent?  Options.
A) 5%  B) 11%  C) 13%  D) 21%  E) 19%
Let S.P. = $100   C.P. = $90   Profit = $10   Profit% = 10/90 * 100 = 25/6 = 11% approximately   Answer is 11%
<result>B</result>
If the cost price is 90% of the selling price, then what is the profit percent?