Cream costs twice as much as skim milk. A certain brand of milk is 4/5 cream and 1/5 skim milk. What fraction of the cost of this brand is due to the cream? Choose the correct choice from the following answers.
A) 3/4
B) 4/5
C) 5/6
D) 7/8
E) 8/9
Let x be the cost of the skim milk in the mixture.   The cost of the cream is 4x*2 = 8x.   The total cost is x+8x  4 *2= 
<gadget id="calculator"> 4 *2</gadget>
<output>8</output>
8x.   The total cost is x+8x= 9x and the fraction due to the cream is 8x / 9x = 8/9   The answer is 8/9.
<result>E</result>
Cream costs twice as much as skim milk. A certain brand of milk is 4/5 cream and 1/5 skim milk. What fraction of the cost of this brand is due to the cream?