Use the Following General Linear Supply Function $Q _ { 5 } = 40 + 6 P - 8 P _ { I } + 10 F$

Multiple Choice

Use the following general linear supply function: $Q _ { 5 } = 40 + 6 P - 8 P _ { I } + 10 F$ where $Q _ { 5 }$ is the quantity supplied of the good,P is the price of the good, $P _ { I }$ is the price of an input,and F is the number of firms producing the good.Now suppose $P _ { I }$ = $40 and F = 50,what is the largest amount of the good that firms will supply when the price of the good is $20?

A) 340 units
B) 220 units
C) 120 units
D) 80 units