Carson, Incorporated, which uses the high-low method, reported total costs of $22.5 per unit at its lowest activity level, when production equaled 8,400 units. When production doubled, at its highest activity level, the total cost per unit dropped to $14. Carson would estimate variable cost per unit as:

Question 24 options:

a)	$8.25
b)	$5.5
c)	$10.
d)	$11.