Solution :
1.
The income from renting his showroom that Paolo would receive if he allowed to rent his showroom is a Implicit cost as this is a cost which will not be paid in actual.
The wages as well as the utility bills paid by Paolo is an example of explicit cost as this cost would be paid in actual for the businesses and are added in accounting.
The wholesale amount that Paolo pays for the pianos to the manufacturer is an explicit cost and is aid in actual to the manufacturer.
The salary that Paolo could have earned if he choses to be an accountant will be an implicit cost as this cost is not paid in actual.
2. Paolo's accounting profit can be calculated by :
Accounting profit = revenue - explicit cost
= 851,000 - 476,000 - 281,000
= $ 94,000
3. Paolo's economic profit is :
Economic profit = accounting profit - implicit profit
= 94,000 - 34,000 - 71,000
= -11,000