Please check my answers if they are correct! If not, please make corrections. Thank you!

Bob, owner of Bob’s Auto, sells cars. The number of car sales is represented by y. Bob buys autos at a price of A each and has no other costs. He only buys as many cars as he sells.

a) What is his total cost if he sells 10 cars? What if he sells 20 cars? What is the equation for Bob’s total costs assuming he sells “y” cars?

b)What is Bob’s AC(y)? For every additional auto Bob sells, by how much do his costs increase? What is Bob’s MC (y)?

c) What does Bob’s ACV and MC costs look like in a graph if A = $20?

d) Suppose Bob has to pay B per year to produce obnoxious television commercials. What is Bob’s new total cost curve and his average cost curve and his marginal cost curve?

e) If A = 20 and B = 100, evaluate Bob’s AC at y output levels of 5,10, 25 and 40.

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MY ANSWERS:

a)
10A is his total cost if he sells 10.
20A is his total cost if he sells 20.
C(y)=Ay

b)
AC(y)=A/y is his AC function.
His costs increase 1/y. MC(y)=A/y is his MC.

c) a horizontal flat line at AC/MC (or y-axis) = 20 (where the x-axis is his output-number of cars sold- and the y-axis is his AC/MC)

d)
c(y) = Ay + B
AC(y) = A + B/y
MC(y) = A + By

e)
(5,40) at output level (y) = 5
(10,30) at y = 10
(20,25) at y = 20
(25,24) at y = 25
(40,22.5) at y = 40

a) I agree

b) His total cost from a) is Ay. So average cost is Ay/y = A. Since it cost Bob A for each car, regardless of the number, MC=A

c) I agree

d) for C(y) = Ay + B and
AC(y) = (Ay + B)/y = A + B/y (I agree)
However regardless of the advertising expenses, it still cost Bob A per car, so, MC(y) = A

e) I agree

Your answers are mostly correct. Here are the corrections:

a) The total cost if Bob sells 10 cars is 10A, and if he sells 20 cars, it is 20A. The equation for Bob's total costs assuming he sells "y" cars is C(y)=yA. You missed the "y" in your equation.

b) The correct equation for Bob's average cost (AC) is AC(y)=A/y, which you stated correctly. And for every additional auto Bob sells, his costs actually decrease by 1/y, not increase. So his costs decrease by 1/y for each additional car sold. The correct equation for Bob's marginal cost (MC) is MC(y)=A, which you missed. It remains constant at A regardless of the quantity of cars sold.

c) You were right that the graph of AC and MC costs would be a horizontal flat line at AC/MC (or y-axis) = 20 when A = $20. However, you missed specifying the range of the x-axis, which should represent the output (number of cars sold). So the graph should cover the range of possible values for the number of cars sold.

d) For the new total cost curve when Bob has to pay B per year to produce obnoxious television commercials, the correct equation is c(y) = Ay + B. You missed the "B" term in your equation. The average cost curve remains the same as before, AC(y) = A/y. And the marginal cost curve also remains the same, MC(y) = A.

e) Evaluating Bob's AC at y output levels of 5, 10, 25, and 40 when A = 20 and B = 100:
- AC(5) = 20/5 = 4
- AC(10) = 20/10 = 2
- AC(25) = 20/25 = 0.8
- AC(40) = 20/40 = 0.5

So the corrected answers for part e) would be:
(5, 4)
(10, 2)
(25, 0.8)
(40, 0.5)

Overall, good effort in answering the questions! Keep in mind the corrections mentioned above for a more accurate response.