Answer:
rate: 18.99
underapplied for 68,600
cost of goods sold 68,600 debit
factory overhead 68,600 credit
This decrease the net operating income as we have more cost.
Step-by-step explanation:

the predetermined overhead rate will be calcualte by dividing the expected cost over the cost driver. In this case, computer-hours
1,278,000 / 82,000 = 15.585 fixed
we will add the variable overhead of 3.4 for a total of: 18,985 = 18.99
actual overhead: 1,208,000
applied ovehread 60,000 x 18.99 = 1.139.400
as the appleid is lower than actual, the overehad was underapplied we need to recognize more cost of goods sold.
underapplied for: 1,208,000 - 1,139,400 = 68,600