(A) Over what range of the Input X will marginal costs be falling if Px is not offered by the amount purchased?

(B) At approximately what level of employment Input X will average variable cost be maximized?

(C)If Px=$25, what is the minimum average variable cost in the production system?

(D)What is the marginal cost of production at 60 units of output ?

(E)If the price of output is $2 per unit, is employment of 3 units of X optimal for a profit- maximizing firm? (assume X cost $25 Plu)