If output is 1, total cost is 7, and total revenue is 10. What is the marginal revenue?

If marginal profit is $33 and marginal revenue is $80 What's the value of Marginal cost

It costs a coat manufacturer $8750 to make 125 coats and it costs $6500 to make 80 coats.  Each coat is sold for $250.     a. How much is the marginal cost?  Round to two decimal places if rounding is necessary.  Do not enter a fraction.  There is a $ sign next to the answer box, so do not type a $ sign in your answer.  Only type a number (do not type any units on your answer).     $       b. What is the slope of the Profit function, P(x)?  Round to two decimal places if rounding is necessary.  Do not enter a fraction.  There is a $ sign next to the answer box, so do not type a $ sign in your answer.  Only type a number (do not type any units on your answer).     $      c. How many coats must be sold in order to break even?  Round to the nearest whole number if rounding is necessary.  Do not enter a fraction.  Only type a whole number (do not type any units on your answer).

1. Micky's auto mechanic shop has a daily total cost represented by: C = 98 + 2q + 2q². Shop's marginal cost is given by: MC = 2 + 4q, where q is the number of repaired cars. a. b. Derive an expression for average cost. Find the quantity range where the shop experientes the economies scale (Hint: scale economy AC index is given by: S = MC). At what production level are scale economies exhausted??