Use the information below to answer the followingquestion(s).

Willis Corporation manufactures industrialsized gas furnaces and uses budgeted machinehours to allocate variable manufacturing overhead. The following information pertains to thecompany's manufacturing overheaddata:

Budgeted output

30,000 units

Budgeted machinehours

10,000 hours

Budgeted variable manufacturing overhead costs for30,000 units

$322,500

Actual output produced

44,000 units

Actual machinehours used

14,400 hours

Actual variable manufacturing overhead costs

$484,000

What is the variable overhead efficiencyvariance?