Pedro sells investment land on September $1,2021.$ Information pertaining to the sale follows:

Adjusted basis $$25,000$

Selling price $90,000$

Selling expenses $1,500$

Down payment $12,000$

Four installment payments $15,000$

Mortgage assumed by the buyer $18,000$

Each installment payment is due on September $1$ of $2022,2023,2024,$ and $2025($ignore interest$).$ Determine the tax consequences in $2021,2022,2023,2024,$ and $2025.$