Grace Co$.$ can further process Product B to produce Product C$.$ Product B is currently selling for $$19$ per pound and costs $$17$ per pound to produce. Product C would sell for $$36$ per pound and would require an additional cost of $$9$ per pound to produce.

The differential revenue of producing and selling Product C is

a$.$ $$27$ per pound

b$.$ $$19$ per pound

c$.$ $$17$ per pound

d$.$ $$36$ per pound