Answer:
$0.30 per direct labor-hour
Step-by-step explanation:
The computation of the variable cost per direct labor is shown below:
Variable cost per direct hour = (High maintenance cost incurred - low maintenance cost incurred) ÷ (High direct labor hours - low direct labor hours)
= ($4,000 - $1,900) ÷ (9,000 hours - 2,000 hours)
= $2,100 ÷ 7,000 hours
= $0.30 per direct labor-hour