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 35% impurities to the product. Find the net profit percentage of the dealer?  Select the correct option.
A) 44%  B) 40%  C) 68.75%  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 35% impurities to the product.   It means that he is selling $5 worth of product for $6.75.   So his profit is $6.75-$4 = $2   and his profit percent is    (2.75/4)*100= 
<gadget id="calculator"> (2.75/4)*100</gadget>
<output>68.75</output>
68.75%   Answer:- 68.75%
<result>C</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 35% impurities to the product. Find the net profit percentage of the dealer?