Branch Corporation uses a standard cost system to account for the costs of its one product Variable overhead is applied using direct labor hours. Standards allowed for each unit are 3 hours of labor at a variable overhead rate of $10.00. During November, Branch Corporation produced 2,300 units. Payroll totaled $97,780 for 7,140 hours worked. Variable overhead incurred totaled $73,185. Required: a. Calculate the variable overhead rate variance. Note: Indicate the effect of variance by selecting "Favorable", "Unfavorable", or "None" for no effect (i.e., zero variance). b. Calculate the variable overhead efficiency variance. Note: Indicate the effect of variance by selecting "Favorable", "Unfavorable", or "None" for no effect (i.e., zero variance). c. Calculate the variable overhead spending variance. Note: Indicate the effect of variance by selecting "Favorable", "Unfavorable", or "None" for no effect (i.e., zero variance). a. Rate Variance b. Efficiency Variance c. Spending Variance