5. Suppose the monthly cost, in dollars, of producing x day packs is and currently 30 day packs are produced monthly.

C(x)= 0.001x³+ 0.07x²+ 19x + 550

a: What is the current monthly cost?

b: What would be the additional cost of increasing to 31 day packs monthly.

c: What is the marginal cost when x= 30?

d: Describe what quantity in part (c) represents.

6: High Wire Electronics determines the following demand function for a new game:

where q is the number of games sold per day when the price is x dollars per game.

q= D(x)=200x3

a: Find the elasticity.

b: Find the elasticity when x= 3.

c: At x=3 will a small increase in price cause total revenue to increase or decrease?