PB$7)$ Marymount Company makes one product. In the month of April, it made $3,500$ units. Workers were paid $$32$ per hour for labor, for a total of $$718,848.$ The standard hours per unit are $6\mathrm{.}4,$ and the standard labor wage rate is $$38\mathrm{.}40$ per hour. What is the direct labor rate variance for April?