Hi can you please help with these 3 questions

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Grace Co. can further process Product B to produce Product C. Product B is currently selling for $23 per pound and costs $17 per pound to produce. Product C would sell for $44 per pound and would require an additional cost of $12 per pound to produce. What is the differential revenue of producing and selling Product C? Oa. $44 per pound Ob. $27 per pound Oc, $21 per pound Od. $32 per pound