310% is the change from 20 to 82
Calculation steps:
[( 82 - 20 ) ÷ 20] x 100 = 310%
Formula
Percentage change = [(82 - 20) / 20] x 100
Subtract the new number by the original number
82 - 20 = 62
62 ÷ 20 = 3.1
3.1 x 100 = 310%
Example