ACCT - Golf Glider makes gasoline-powered golf carts

Golf Glider makes gasoline-powered golf carts. The selling price is $5,000 each, and costs are as follows:

Golf Glider’s income is taxed at a 40 percent rate.

a. How many golf carts must Golf Glider sell to earn $600,000 after tax? Round your answer to the nearest whole number.
b. What level of revenue is needed to yield an after-tax income equal to 20 percent of sales? Round percentages to the hundredths place (Ex., 10.2265 rounded to 10.23). Round your final answer to the nearest whole dollar