ducing the profit maximizing output level and at this output level, the marginal cost is $4 and the profit maximizing price is $9, what is the markup?…

If a monopolist is producing the

profit

maximizing

output level and at this output​ level, the marginal cost is​ $4 and the

profit

maximizing

price is​ $9, what is the​ markup?

A.

2

B.

5

C.

2.25

D.

0.22