Answer:
$20,500
Explanation:
Economic profit is the difference between the total revenue generated and the total explicit (direct) and implicit  (Indirect cost ) incurred
Total revenue  - (explicit cost + implicit cost )
Revenue             80,000
Explicit cost
Labor                               5000
maintenance                         2000
Electricity                            1000
Total                (8000)
Implicit cost                        Â
loan revenue forgone                  1500
Previous earning                      50000
Total                (51,500)
Economic profit       20,500