The next two questions refer to the following table showing amonopolist’s demand schedule

Price	Quantity
$50	300
40	600
20	800
10	1,000

What is marginal revenue for a pricedecrease from $50 to $40?

a.         $9,000

b.         $24,000

c.         $30

d.         $20

e.         $40

If price falls from $20 to $10, then,

a.         MR =-$10, and demand is inelastic.

b.         MR =$10, and demand is elastic.

c.         MR =$30, and demand is elastic.

d.         MR =-$30, and demand is inelastic.

e.         none of theabove