Answer and Explanation:
The journal entry is given below:
a. Work in process ($4,850 + $2,420 + $1,910 + $3,570) $12,750
Factory overhead $1,660
To wages payable $14,410
(being the factory labor cost is recorded)
b. Work in process Dr ($12,750 ÷ $17 × $28) $21,000
To factory overhead $21,000
(being the factory overhead is applied)
These two entries should be recorded for an individual parts