Answer:
$86
Explanation:
Missing word "What could be the net annual cost"
Monthly fee = $20
Interest rate = 4% = 0.04
Average monthly balance = $600
Net annual cost = $20*5 - 0.04*$600*7/12
Net annual cost = $100 - $14
Net annual cost = $86
So, the net annual cost of this account is $86.