Japan Company produces lamps that require $2$ standard hours per unit at a standard hourly rate of $$19\mathrm{.}20$ per hour. Production of $4,300$ units required $8,860$ hours at an hourly rate of $$19\mathrm{.}80$ per hour.

What is the direct labor $($a$)$ rate variance, $($b$)$ time variance, and $($c$)$ total cost variance? Enter favorable variances as negative numbers.

a$.$ Direct labor rate variance

b$.$ Direct labor time variance

$ $$

$ $$

c$.$ Total direct labor cost variance

$ $$