Direct Labor Variances

Venneman Company produces a product that requires $3$ standard hours per unit at a standard hourly rate of $$9\mathrm{.}00$ per hour. If $4,800$ units required $15,000$ hours at an hourly rate of $$8\mathrm{.}64$ per hour, what is the direct labor $($a$)$ rate variance, $($b$)$ time variance, and $($c$)$ total direct labor cost variance? Enter a favorable variance as a negative number using a minus sign and an unfavorable variance as a positive number.