Explanation:
The computation is shown below:
1. For Predetermined overhead rate
Predetermined overhead rate = (Total estimated manufacturing overhead for 4 months) ÷ (Total number of units)
where,
Total estimated direct manufacturing cost is
= $166,400 × 4 months
= $665,600
And, the total number of units is
= 4,700 units + 8,700 units + 4,300 units + 7,900 units
= 25,600 units
So, the predetermined overhead rate is
= $665,600 ÷ 25,600 units
= $26 per unit
2. Now the allocated cost for each month is shown below:
For January
= 4,700 units × $26
= $122,200
For February
= 8,700 units × $26
= $226,200
For March
= 4,300 units × $26
= $111,800
For April
= 7,900 units × $26
= $205,400
c. Now the total cost per unit is
= $22 + $26
= $48 per unit