McRobert's TV Shop Sells 400 Sets Per Month, at a Price

question 144

Multiple Choice

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

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