The price of a product is $a. Bill bought s products and then sold 80 percents of them $b. which of the following represents the whole deal if Bill’s profit was three times the cost?
A. 0.8sb = 4sa.
B. (1-0.8) s ab = 3s.
C. 3(0.8a sb) = sa.
D. (s-0.8s) (b-a) = 3.
E. (s0.8s) / (b-a) = 3.
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