Accounting profit is what you typical would think of when talking about "profit". To find this, you subtract the costs of rent, produce, labor and whatever else from your total revenue.
Rent/Produce: $45,000
Revenue: $60,000
Accounting Profit: $15,000
Economic profit is fancier and takes into account more things - opportunity costs.
Revenue $60k
Explicit opportunity costs ( Rent/Produce ) : $45k
Implicit opportunity costs:
You could have gotten a job making $10/ hr and made 20k that year instead of doing a fruit stand.
You could have put 45k in the bank and made 2k in interest...
60k - ( 45k + 20k + 2k) = -7k so you lost money