Answer and Explanation:
The a part covers all the other parts itself
The Journal entries are shown below:-
b. Work in progress Dr, $10,500
Manufacturing overhead Dr, $800
To Raw material inventory $11,300
(Being issuance of raw material is recorded)
c. Work in progress Dr, $12,300
Manufacturing overhead Dr, $1,800
To Wages payable $14,100
(Being accrual of payroll costs is recorded)
d. Work in progress inventory Dr, $6,150 ($12,300 × 50%)
To Manufacturing overhead $6,150
(Being manufacturing overhead is recorded)