A) There is only one combination of A and B that makes a total output of 312 and this is when 7 units of A and 7 units of B are employed. TP is 144 + 168 = 312. The cost incurred is 7*4 + 7*8 = $84
B) Profit is maximized when A and B are hired according to MRP = price of input rule
Since price of A is 4, we must hire 7 units of A as its MRP is 4. Similarly, price of B is 8, we must hire 8 units of B as its MRP is 8. Hence profit maximization bundle is same as cost minimization for 312 units
Profit = 312*1 - 84 = 228
C) Total output is 312 units. Profit = TRA + TRB - TC = 144 + 168 - (7*4 + 7*8) = 228
Note: MRP = MP * price of final output
TP = cumulative sum of marginal product
TRA or TRB = total revenue from A or B = TP * price of final good.
TRA | Quantity of resources A | MP of A | TP | MRP | Quantity of resources B | MP of B | TP | MRP | TRB |
40 | 1 | 40 | 40 | 40 | 1 | 40 | 40 | 40 | 40 |
72 | 2 | 32 | 72 | 32 | 2 | 36 | 76 | 36 | 76 |
96 | 3 | 24 | 96 | 24 | 3 | 32 | 108 | 32 | 108 |
116 | 4 | 20 | 116 | 20 | 4 | 24 | 132 | 24 | 132 |
132 | 5 | 16 | 132 | 16 | 5 | 16 | 148 | 16 | 148 |
140 | 6 | 8 | 140 | 8 | 6 | 12 | 160 | 12 | 160 |
144 | 7 | 4 | 144 | 4 | 7 | 8 | 168 | 8 | 168 |
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