Abbott has a standard variable overhead rate of $4.50 per machine hour, and each unit produced has a standard time allowed of 3.10 hours. The company's static budget was based on 46,000 units. Actual results for the year follow.

Actual units produced: 50,000 Actual machine hours worked: 150,000 Actual variable overhead incurred: $660,000

Abbott's variable-overhead spending variance is:

$22,500 favorable.

$15,000 favorable.

$22,500 unfavorable.

None of these.

$15,000 unfavorable.

Abbott's variable-overhead efficiency variance is:

$22,500 favorable.

$-22,500 unfavorable.

$-15,000 unfavorable.

None of the above.

$15,000 favorable.