If the variable cost rises from $75 to $ 100 as output increases from 15 to 20 units, the marginal cost of the twentieth

[answerhappygod]

If the variable cost rises from $75 to $ 100 as output increases
from 15 to 20 units, the marginal cost of the twentieth unit
is:
A. $ 100
B. $ 5
C. $ 40
D. $ 8
E. cannot be determined without total cost.
2. Which of the following is likely to have the
most elastic price elasticity of demand (has the most
substitutes)?
automobiles.
pickup trucks.
Hondas.
the John Smith Honda dealer.