A dishonest grocer professes to sell pure butter at cost price, but he mixes it with adulterated fat and thereby gains 45%. Find the percentage of adulterated fat in the mixture assuming that adulterated fat is freely available?
Choose the most appropriate option:
A) 20%	B) 25%	C) 33.33%	D) 40%	E) 35%
Say 100g pure butter costs $100   But; $100 is his 25% profit because he just used 80gram pure butter.   80g would have costed him $80 and he sold it for $100 by adding 20g of freely available fat. $100 is 1.45(65)   so;   total weight=100g   fat=35g   35%   35%
<result>E</result>
A dishonest grocer professes to sell pure butter at cost price, but he mixes it with adulterated fat and thereby gains 45%. Find the percentage of adulterated fat in the mixture assuming that adulterated fat is freely available?