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 30% impurities to the product. Find the net profit percentage of the dealer?  Answers:
A) 44%
B) 40%
C) 50%
D) 56.25%
E) 37.5%
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 30% impurities to the product.   It means that he is selling $5 worth of product for $5.5.   So his profit is $5.5-$4 = $1.5   and his profit percent is   (1.5/4)*100 5.5- 4= 
<gadget id="calculator">5.5- 4</gadget>
<output>1.5</output>
$1.5   and his profit percent is    (1.5/4)*100= 
<gadget id="calculator"> (1.5/4)*100</gadget>
<output>37.5</output>
37.5%   Answer:- 37.5%
<result>E</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 30% impurities to the product. Find the net profit percentage of the dealer?