4. Riviera Beach Pink Flamingos has the following standards and flexible-budget data. Standard variable-overhead rate $6.00 per direct-labor hour Standard quantity of direct labor 2 hours per unit of output Budgeted fixed overhead $100,000 Budgeted output 25,000 units Actual results for April are as follows: Actual output 20,000 units Actual variable overhead $320,000 Actual fixed overhead $97,000 Actual direct labor 50,000 hours Required: Use the variance formulas to compute the following variances. Indicate whether each variance is favorable or unfavorable, where appropriate. (a) Variable-overhead spending variance (4 points). (b) Variable-overhead efficiency variance (4 points). (e) Fixed-overhead budget variance (4 points). (d) Fixed-overhead volume variance (4 points)