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Riverside Manufacturing designs and manufactures bathtubs for home and commercial applications. Riverside recorded the following data for its commercial bathtub production line during the month of​ March:
Standard DL hours per tub 5
Standard variable overhead rate per DL hour $ 6.00
Standard variable overhead cost per unit $ 30.00
Actual variable overhead costs $ 16,400
Actual DL hours 2,050
Actual variable overhead cost per machine hour $ 8.00
Actual tubs produced 1,500
1. What is the variable manufacturing overhead efficiency variance in​ March?