Grace Co$.$ can further process Product B to produce Product C$.$ Product B is currently selling for $$21$ per pound and costs $$17$ per pound to produce. Product C would sell for $$41$ per pound and would require an additional cost of $$11$ per pound to produce.

The differential revenue of producing and selling Product C is

a$.$ $$24$ per pound

b$.$ $$41$ per pound

c$.$ $$20$ per pound

d$.$ $$30$ per pound