A review of industry wide data for the jelly and jam manufacturing industry suggests the following industry supply function:

Q =  -59,000,000 + 500,000P - 125,000P_L

- 500,000P_K + 2,000,000W,

Where Q is cases supplied per year, P is the wholesale price per case ($), P_L is the average price paid for unskilled labor ($), P_K is the average price of capital (in percent), and W is weather measured by the average seasonal rainfall in growing areas (in inches).

A. Determine the industry supply curve for a recent year when P_L = $8, P_K = 10 percent, and W = 20 inches of rainfall. Show the industry supply curve with quantity expressed as a function of price and price expressed as a function of quantity.

B. Calculate the quantity supplied by the industry at prices of $50, $60, and $70 per case.

C. Calculate the prices necessary to generate a supply of 4 million, 6 million, and 8 million cases.