$)$ Gregor has the following information pertaining to its usage of direct labor in a recent period:

Total units manufactured $6,800$

Total direct labor hours used $21,000$

Actual wage rate per hour $$15$

Standard wage rate per hour $$14$

Standard hours per unit of output $3\mathrm{.}25$

a$.$ What is the total $ amount of the direct labor efficiency $($or usage, or quantity$)$ variance for the period? Is it favorable or unfavorable?

b$.$ What is the total $ amount of the labor rate variance for the period? Is it favorable or unfavorable?