2100% is the change from 20 to 440
Calculation steps:
[( 440 - 20 ) ÷ 20] x 100 = 2100%
Formula
Percentage change = [(440 - 20) / 20] x 100
Subtract the new number by the original number
440 - 20 = 420
420 ÷ 20 = 21
21 x 100 = 2100%
Example