Carmen Co$.$ can further process Product J to produce Product D$.$ Product J is currently selling for $$21\mathrm{.}80$ per pound and costs $$14\mathrm{.}60$ per pound to produce. Product D would sell for $$35\mathrm{.}50$ per pound and would require an additional cost of $$10\mathrm{.}30$ per pound to produce.

The differential cost of producing Product $D$ is

a$.$ $$6\mathrm{.}18$ per pound

b$.$ $$12,36$ per pound

c$.$ $$8\mathrm{.}24$ per pound

d$.$ $$10\mathrm{.}30$ per poundC