Answer and Explanation:
The computation is shown below:-
a) raw-materials is
= (8,000 - 7,600) × $80
= $32,000
b) work in process 7,500 batteries x $80 x 10%
= $60,000
c) Finished goods = 7,500 batteries × $80 × 90% × 30%
= $162,000
d) cost of goods sold 7,500 batteries x $80 × 90% × 70%
= $378,000
e) selling expense is
= 100 × $80
= $8,000
Total 8,000 batteries purchased × $10 per battery is
$80,000
2. Specification is shown below:
a) rawmaterials  stock               $32,000  Balance Sheet
b) work inprocess                     $60,000   BalanceSheet  
c) Finishedgoods stock            $162,000   BalanceSheet
d) cost of goodssold                 $378,000   IncomeStatement
e) sellingexpense                     $8,000   IncomeStatement