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Carmen Co$.$ can further process Product J to produce Product D$.$ Product J is currently selling for $$20\mathrm{.}50$ per pound and costs $$14\mathrm{.}15$ per pound to produce. Product D would sell for $$39\mathrm{.}35$ per pound and would require an additional cost of $$11\mathrm{.}75$ per pound to produce.

What is the differential cost of producing Product D$?$