Use the Following General Linear Supply Function to Answer the Next

Use the following general linear supply function to answer the next 6 questions:

where is the quantity supplied of the good, P_I is the price of the good, is the price of an input, and F is the number of firms producing the good.
-If

= $20 and F = 60 what is the equation of the supply function?

A) = 400 + 6 P
B) = 40 + 8 P
C) = 480 + 6
D) = 480 + 6 P
E) none of the above