2000% is the change from 21 to 441
Calculation steps:
[( 441 - 21 ) ÷ 21] x 100 = 2000%
Formula
Percentage change = [(441 - 21) / 21] x 100
Subtract the new number by the original number
441 - 21 = 420
420 ÷ 21 = 20
20 x 100 = 2000%
Example