Musket Oil performs oil changes. The standard wage rate for oil change technicians is $18 per hour. By analyzing its past records of time spent on oil changes, the company has developed a standard of 15 minutes (or 0.25 hours) per oil change. In July, 1,500 oil changes were performed at Musket Oil. Oil change technicians worked a total of 315 direct labor hours at an average rate of $19 per hour. Read the Requirement 1. Calculate the direct labor rate variance. Determine the formula for the rate variance, then compute the rate variance for the direct labor. (Enter the result as a positive number. Label the variance as favorable (F) or unfavorable (U). Enter the currency amount in the formula to the nearest cent, then round the final variance amount to the nearest whole dollar. Abbreviations used: DL=D irect labor.) Requirements 1. Calculate the direct labor rate variance. 2. Calculate the direct labor efficiency variance