Question 3: Basic calculus The selling price of a particular type of car is $20,000. The total cost of producing the car is TC = 2000 + X^2 . A. Find the marginal revenue function? B. Find the marginal cost function? C. Find the quantity that maximizes profit?

Question 4: Progressions

A woman borrows $1500, agreeing to pay $100 at the end of each month to reduce the outstanding principal and agreeing to pay the interest due on any unpaid balance at a rate of 12% per annum (i.e., 1% per month). Determine the sum of all interest payments.