human
A certain tree was 100 meters tall at the end of 2017. It will grow 10% more than its previous height each year. How long has the tree grown from 2017 until the end of 2019?
assistant
How many meters will the tree grow in 2018? ** At the end of 2018, the tree will grow 100 x 10/100 = <<100*10/100=10>>10 meters more.
How tall will the tree be at the end of 2018? ** Thus, its height at the end of 2018 is 100 + 10 = <<100+10=110>>110 meters.
How many meters will the tree grow in 2019? ** At the end of 2019, the tree will grow 110 x 10/100 = <<110*10/100=11>>11 meters more.
How tall will the tree be at the end of 2019? ** So, its height at the end of 2019 is 110 + 11 = <<110+11=121>>121 meters.
How many meters has the tree grown from 2017 until the end of 2019? ** Therefore, the tree has grown 121 - 100 = <<121-100=21>>21 meters.
#### 21