Pedro sells investment land on September 1, 2018. 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 2019, 2020, 2021, and 2022 (ignore interest). Determine the tax consequences in 2018, 2019, 2020, 2021, and 2022.