Answer:
$4500
Step-by-step explanation:
We can calculate the total change in benefits by deducting the opportunity cost of spending the hours with your family by the annual salary.
Opportunity cost = $20/hour x 200 Additional hours
Opportunity cost = $4000
Total change in benefit = Annual salary - Opportunity cost
Total change in benefit = $8500 - $4000
Total change in benefit = $4500