c)The total combined direct labor cost for the two months is $21,280
the total combined direct labor cost is the sum of the direct labor cost for April and May
Direct labor hour needs for the two months are calculated as
For April
7,700 units × 0.20
=1,540 units
For May
7,500 units × 0.20
=1,500 units
direct labor rate per hour for each month is equal to $7.00
The total direct labor cost for the month of April would be
=$7.00 × 1,540 units
=$10,780
The total direct labor cost for the month of May would be
=$7.00 × 1,500 units
=$10,500
Hence, the total direct labor cost for April and May is calculated by adding both costs.
=$10,780 + $10,500
=$21,280
Therefore option c is the correct answer.
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