August, $43,500$ hours of labor are incurred at a cost of $$12\mathrm{.}80$ per hour to produce $11,600$ units of Product DD$.$

$($a$)$

Compute the total labor variance.

Total labor variance

$($b$)$

Compute the labor price and quantity variances. $.$

Labor price variance

Labor quantity variance $

$($c$)$

Compute the labor price and quantity variances, assuming the standard is $4\mathrm{.}1$ hours of direct labor at $$12\mathrm{.}90$ per hour.

Labor price variance

Labor quantity variance