Answer
d
Work Step by Step
Find the average cost per unit, and then multiply by the number of units remaining.
average=$[(5000\times8)+(15000\times10)+(20000\times12)]\div(5000+15000+20000)=[40000+150000+240000]\div40000=430000\div40000=10.75$
value=$7000\times10.75=75250$