Japan Company produces lamps that require $3$ standard hours per unit at an hourly rate of $$16\mathrm{.}50$ per hour. Production of $6,200$ units required $18,230$ hours at an hourly rate of $$17\mathrm{.}00$ per hour. Enter favorable variances as negative numbers.

$($a$)$ Determine the direct labor rate variance. $fill in the blank $1$

$($b$)$ Determine the direct labor time variance. $fill in the blank $3$

$($c$)$ Determine the cost variance. $fill in the blank $5$