210% is the change from 10 to 31
Calculation steps:
[( 31 - 10 ) ÷ 10] x 100 = 210%
Formula
Percentage change = [(31 - 10) / 10] x 100
Subtract the new number by the original number
31 - 10 = 21
21 ÷ 10 = 2.1
2.1 x 100 = 210%
Example