please explain steps

2. You invested $20,000 in the stock market at the beginning of the year 2018 , added another $10,000 at the beginning of 2019 , and withdrew all funds at the beginning of 2020. The returns on the stock market were +10% in 2018 and 10% in 2019 what is the average return earned by your investments? What is the type of average (arithmetic geometric or IRR)