Final answer:
The predetermined manufacturing overhead rate per machine hour is $12.32.
Step-by-step explanation:
To calculate the predetermined manufacturing overhead rate per machine hour, we need to divide the estimated manufacturing overhead cost by the estimated machine hours. In this case, the estimated manufacturing overhead cost is $251,263 and the estimated machine hours are 20,376. Dividing these two values, we get:
Predetermined manufacturing overhead rate = $251,263 / 20,376 = $12.32
Therefore, the correct answer is A) $12.32.