A dishonest dealer claims to sell a product at its cost price. He uses a counterfeit weight which is 20% less than the real weight. Further greed overtook him and he added 40% impurities to the product. Find the net profit percentage of the dealer?  Choose the correct choice from the following options
A) 94%  B) 87.5%  C) 55%  D) 56.25%  E) 36%
The dealer uses weight which is 20% less than the real weight. or (1- 1/5) or 4/5 of real weight.   It means that he is selling $4 worth of product for $5.   The dealer then further added 50% impurities to the product.   It means that he is selling $5 worth of product for $7.5.   So his profit is $7.5-$4 = $3.5   and his profit percent is   (3.5/4)*100 7.5- 4= 
<gadget id="calculator">7.5- 4</gadget>
<output>3.5</output>
$3.5   and his profit percent is    (3.5/4)*100= 
<gadget id="calculator"> (3.5/4)*100</gadget>
<output>87.5</output>
87.5%   Answer:- 87.5%
<result>B</result>
A dishonest dealer claims to sell a product at its cost price. He uses a counterfeit weight which is 20% less than the real weight. Further greed overtook him and he added 40% impurities to the product. Find the net profit percentage of the dealer?