8. Suppose you are able to mow lawns at $12 per hour.

The only cost to you is the opportunity cost of your time. For the first 3 hours, the opportunity cost of your time is $9 per hour. But after 3 hours, the opportunity cost of your time rises to $15 per hour because of other commitments.

Draw the marginal cost to you of mowing lawns. On that diagram, draw in the price you receive for mowing loans, indicate for how long you will mow lawns, and graphically indicate the area of your producer surplus in addition to calculating the magnitude of your producer surplus.