Suppose a firm faces a downward sloping demand curve, Q(P), of the form

Q = 50-10P.

Of course we know that the inverse demand, P(Q) for the above is

P=5-(1/10)Q.

What is Marginal Revenue? (hint: TR= P*Q and MR = dTR/dQ)

Group of answer choices

MR = 5-(1/5)Q

MR = 5-(1/10)Q

MR = 10Q

MR = 50Q