Dan sold 135 shares ( assume 100 are long-term) of elite mutual fund on July 23, 2018 for $95 per share are received a 1099-B ( box 3 was not checked for basis) to record the sale of the shares Dan's investment portfolio includes the following purchases of elite mutual fund.

May 20,2016 50 shares at $100.00 per share,

may 19, 2017 50 shares at $95.00 per share,

August 21, 2018 50 shares at $85.00 per share,

February 22, 2019 100 shares at $ 75.00 per share.

Dan will recognize in 2019 ?

Could you brake down the formula with the steps please?