Answer:
Part a
Debit  : Raw material $4,200
Credit : Accounts Payable $4,200
Part b
Debit  : Salaries $18,000
Credit : Salaries Payable $18,000
Part c
Debit  : Factory utilities $2,200
Debit  : Factory Insurance $1,800
Debit  : Depreciation  $3,500
Credit : Overheads $7,500
Explanation:
The journal entries for each type of manufacturing cost have been prepared above.