Olivera Corporation's flexible budget performance report for last month shows that actual indirect materials cost, a variable cost, was $42,818 and that the spending variance for indirect materials cost was $2,710 unfavorable. During that month, the company worked 14,800 machine-hours. Budgeted activity for the month had been 15,260 machine-hours. The cost formula per machine-hour for indirect materials cost must have been closest to: O $3.02 O $3.09 $2.63 $2.71