Exercise $14-31($Algo$)$ Flexible Budget Variances and Sales Volume Variances $[$LO $14-3,14-4]$

RTI Company$$s master budget calls for production and sale of $18,900$ units for $$98,280,$ variable costs of $$43,470,$ and fixed costs of $$18,400.$ During the most recent period, the company incurred $$32,900$ of variable costs to produce and sell $18,400$ units for $$85,900.$ During this same period, the company earned $$25,900$ of operating income.

$$

Required:

$1.$ Determine the following for RTI Company: $($Do not round intermediate calculations. Round your answers to the nearest whole dollar.$)$

a$.$ Flexible budget operating income.

b$.$ Flexible budget variance, in terms of contribution margin. Was this variance favorable or unfavorable?

c$.$ Flexible budget variance, in terms of operating income. Was this variance favorable or unfavorable?

d$.$ Sales volume variance, in terms of contribution margin. Was this variance favorable or unfavorable?

e$.$ Sales volume variance, in terms of operating income. Was this variance favorable or unfavorable?