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? Let's think step by step and output the final answer after "####".
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At the end of 2018, the tree will grow 100 x 10/100 = <<100*10/100=10>>10 meters more.
Thus, its height at the end of 2018 is 100 + 10 = <<100+10=110>>110 meters.
At the end of 2019, the tree will grow 110 x 10/100 = <<110*10/100=11>>11 meters more.
So, its height at the end of 2019 is 110 + 11 = <<110+11=121>>121 meters.
Therefore, the tree has grown 121 - 100 = <<121-100=21>>21 meters.
#### 21
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?
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