4000% is the change from 2 to 82
Calculation steps:
[( 82 - 2 ) ÷ 2] x 100 = 4000%
Formula
Percentage change = [(82 - 2) / 2] x 100
Subtract the new number by the original number
82 - 2 = 80
80 ÷ 2 = 40
40 x 100 = 4000%
Example