Carmen Co$.$ can further process Product J to produce Product D$.$ Product J is currently selling for $$22\mathrm{.}35$ per pound and costs $$15\mathrm{.}55$ per pound to produce. Product D would sell for $$41\mathrm{.}90$ per pound and would require an additional cost of $$8\mathrm{.}35$ per pound to produce.

The differential cost of producing Product D is

a$.$ $$10\mathrm{.}02$ per pound

b$.$ $$8\mathrm{.}35$ per pound

c$.$ $$6\mathrm{.}68$ per pound

d$.$ $$5\mathrm{.}01$ per pound