Answer:
(a)
For Job G15:
Direct labor = $20,000
Overhead applied = 16,000
Overhead rate =

= 0.8 × 100
= 80%
Overhead applied = Direct labor × 80%
= $20,000 × 80%
= $16,000
Overhead is applied on direct labor. Hence, rate is 80%.
Overhead for Job B10 = Direct labor × 80%
= $54,000 × 80%
= $43,200
Therefore,
Total overhead applied = $43,200 + 45,750 + 16,000
= $104,950
(b) Hence,
Overapplied overhead for February:
= Total overhead applied - Actual Overhead
= $104,950 - $68,500
= $36,450