Alia Co. can further process Product X to produce Product Y. Product X is currently selling for $20 per pound and costs $15 per pound to produce. Product Y would sell for $30 per pound and would require an additional cost of $8 per pound to produce. What is the differential cost of producing Product Y?

a. $23 per pound

b. $15 per pound

c. $8 per pound

d. $5 per pound