The Demand for Microwaves in a Certain Country Is Given

The demand for microwaves in a certain country is given by: D = 8,000 - 30P, where P is the price of a microwave. Supply by domestic microwave producers is: S = 4,000 + 10P. If this economy opens to trade while the world price of a microwave is $50, and the government imposes a tariff of $30 per microwave, then the domestic quantity supplied will be ________ microwaves.

A) 4,000
B) 4,500
C) 4,800
D) 5,000