Marginal cost practice problems

Microeconomics Unit 3. Try each one, then open the worked solution. The Credit Sprint app generates unlimited new versions with fresh numbers.

Problem 1.

Total cost is $355 at 12 units and $378 at 13 units. What is the marginal cost of unit 13?

Show solution

MC = ΔTC ÷ ΔQ = ($378 − $355) ÷ 1 = $23.

Problem 2.

Total cost is $260 at 3 units and $267 at 4 units. What is the marginal cost of unit 4?

Show solution

MC = ΔTC ÷ ΔQ = ($267 − $260) ÷ 1 = $7.

Problem 3.

Total cost is $360 at 7 units and $390 at 8 units. What is the marginal cost of unit 8?

Show solution

MC = ΔTC ÷ ΔQ = ($390 − $360) ÷ 1 = $30.

Problem 4.

Total cost is $345 at 10 units and $359 at 11 units. What is the marginal cost of unit 11?

Show solution

MC = ΔTC ÷ ΔQ = ($359 − $345) ÷ 1 = $14.

Problem 5.

Total cost is $335 at 5 units and $387 at 6 units. What is the marginal cost of unit 6?

Show solution

MC = ΔTC ÷ ΔQ = ($387 − $335) ÷ 1 = $52.

Problem 6.

Total cost is $225 at 7 units and $251 at 8 units. What is the marginal cost of unit 8?

Show solution

MC = ΔTC ÷ ΔQ = ($251 − $225) ÷ 1 = $26.