Answer and Explanation:
1. The plant-wide overhead rate is:-
Plant-wide overhead rate = Total manufacturing overhead ÷ Cost allocation base
= $1,290,000 ÷ 30,000
= $43
2. The departmental overhead rates is
For machining = Total departmental overhead ÷ Cost allocation bases
= $870,000 ÷ 14,500
= $60
For finishing = Total departmental overhead ÷ Cost allocation bases
= $420,000 ÷ 17,500
= $24
3. The manufacturing overhead is
For Job 450 = Plantwide overhead rate × Actual use of allocation base
= $43 × 66
= $2,838
For Job 455 = Plantwide overhead rate × Actual use of allocation base
= $43 × 66
= $2,838
4. The amount of manufacturing overhead is
For Job 450 = Machining + Finishing
= (60 × 11) + (24 × 55)
= $660 + $1,320
= $1,980
For Job 455 = Machining + Finishing
= (60 × 44) + (24 × 44)
= $2,640 + $1,056
= $3,696
5. The single plant-wide rate overcost Job 450 by ($2,838 - $1,980) $858 and under-costs Job 455 by ($2,838 - $3,696) $858
Therefore the job cost is affected and sales price would be unaffected