Answer :
Answer: the correct answer is $39.60 per hour.
Explanation: since the question is about labor standard costs per hour, we have to set aside the material costs and focus on the labor costs. We have to add all the labor costs which means we have to add Carpenters's wage plus Payroll costs plus benefits that is $ 30.00 plus $3.60 plus $6.00 equals $39.60 per hour.