Assembly line workers at Thompson Manufacturing worked a total of $12000$ direct labor hours to produce $36000$ units. The standard for producing one unit is $15$ minutes at a wage rate of $$10.$ If the actual wage rate was $$10\mathrm{.}5$ per direct labor hour, Thompson's direct labor rate variance is

$$4500$ unfavorable.

$$6000$ unfavorable.

$$4500$ favorable.

$$6000$ favorable.