Suppose certain fireworks are legal in a residential area on Canada Day. The fireworks have been approved for safety, but they do cause noise pollution so their use must be limited. Jenny and Salo like to purchase fireworks for their families; the table below shows the net marginal benefit that Jenny and Salo gain from each firework they purchase.

Net marginal benefit	Q Jenny	Q Salo
10	0	0
9	10	5
8	20	10
7	30	15
6	40	20
5	50	25
4	60	30
3	70	35
2	80	40
1	90	45
0	100	50

Instructions: Enter your answers as whole numbers. a. If a quota of 30 fireworks per person is imposed, the marginal benefit of the last firework for Jenny is $ . The marginal benefit of the last firework for Salo is $ . b. In order to reduce the combined purchases of both Jenny and Salo to 60 fireworks, a tax of $ should be imposed. Under this tax, Jenny will purchase fireworks and Salo will purchase fireworks. c. With the tax, the net marginal benefit of the last firework for Jenny is $ and for Salo $ .