McRobert's TV Shop sells 400 sets per month, at a price of $600 per unit. Market research indicates that the shop can sell one additional set for each $1 it reduces the price. The total revenue (in dollars) is given by 
, where x is the number of additional sets beyond the original 400. What is the marginal revenue if 300 more units are sold?
?
A. 0$1,600
B. ?-$100
C. 0$400
D. -$400
E. 0$800
Answer: D
Mathematics
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