Final answer:
John has the highest direct labor costs with $3200.
Step-by-step explanation:
To determine who has the highest direct labor costs, we need to calculate the labor costs for each person.
The costs can be calculated as -
Nadia's labor cost = 60 hours x $20/hr = $1200
John's labor cost = 80 hours x $40/hr = $3200
Saba's labor cost = 80 hours x $36/hr = $2880
Kumar's labor cost = 40 hours x $20/hr = $800
Comparing the labor costs, we can see that John has the highest direct labor costs with $3200.