21.18% is the change from 170 to 206
Calculation steps:
[( 206 - 170 ) ÷ 170] x 100 = 21.18%
Formula
Percentage change = [(206 - 170) / 170] x 100
Subtract the new number by the original number
206 - 170 = 36
36 ÷ 170 = 0.21176470588235294
0.21176470588235294 x 100 = 21.18%