Solution :
It is given that,
Impa Inc. estimated an overhead of $ 400,00 machine hours to be 25,000 and that of direct labor hours of 40,000.
During the month of April, Impa Inc. has a 3000 direct labor hours as well as 4500 machine hours.
Therefore, the overhead applied for the month of April is
machine hours = $ 16 per machine hour
The actual machine hours in April = 4500 machine hours
Therefore the overhead applied = 4500 x 16
= $ 72,000