A Profit-Maximizing Monopoly Faces an Inverse Demand Function Described by the Equation

A profit-maximizing monopoly faces an inverse demand function described by the equation p(y) = 90 - y and its total costs are c(y) = 9y, where prices and costs are measured in dollars. In the past it was not taxed, but now it must pay a tax of 4 dollars per unit of output. After the tax, the monopoly will

A) increase its price by 4 dollars.
B) increase its price by 2 dollars.
C) leave its price constant.
D) increase its price by 6 dollars.
E) None of the above.

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