Answer:
Variable overhead rate variance is $6,570 Favorable.
Step-by-step explanation:
Variable overhead rate variance = variable overhead expenditure variance + variable overhead efficiency variance.
Note : Only data for calculation of variable overhead expenditure variance is available
Variable overhead expenditure variance =Actual activity at standard rate - Actual overheads
= ( 7,300 × $10.00) - $66,430
= $6,570 Favorable
Thus,
Variable overhead rate variance is $6,570 Favorable