Granger Co. can further process Product B to produce Product C. Product B is currently selling for $55 per pound and costs $42 per pound to produce. Product C would sell for $82 per pound and would require an additional cost of $13 per pound to produce. What is the differential revenue of producing and selling Product C?

a.$42 per pound

b.$27 per pound

c.$45 per pound

d.$15 per pound