Answer:
Variable overhead rate variance = $2,870 favorable
Explanation:
Variable overhead rate variance is the difference between the standard cost allowed for variable production overhead and the actual variable cost incurred.
This computed as follows:
                                          $
17,130 hours should have cost ( 17,130 ×7.20)    123336
but did cost                               120,466
Variable overhead rate variance               2870 Favorable
Variable overhead rate variance = $2,870 Â Â Â Â Â Â Â