Parker Co. can further process Product J to produce Product D. Product J is currently selling for $21 per pound and costs $15.75 per pound to produce. Product D would sell for $35 per pound and would require an additional cost of $8.75 per pound to produce. What is the differential cost of producing Product D? $7 per pound O $8.75 per pound $15 per pound O$5.25 per pound