
Answer:
Accountant  34,100 gain
Economist    (6,500) loss
Explanation:
Accountant:
revenue        60,000
operating cost   25,000
Interest expense   900  ( 30,000 x 3%)
net income      34,100
Economist:
revenue   60,000
explicit cost 25,900
implicit cost (opportunity cost):
savings yield:
20,000 x 3% = 600
painter job  40,000
economic loss (6,500)