Answer and Explanation:
The classification is as follows;
When bob worked as an accountant so he could earn the salary so this represent the implicit cost
The cost for the boats that bob paid to the manufactured represent the explicit cost
The rental income that received by bob represent the implicit cost
The wages and utility bills paid by bob represent the explicit cost
The Accounting profit is
= Revenue - explicit cost
= $851,000 - $476,000 - $281,000
= $94000
And, the Economic profit is
= Accounting profit - implicit cost
= $94,000 - $71,000 - $34,000
= -$11,000