2145% is the change from 20 to 449
Calculation steps:
[( 449 - 20 ) ÷ 20] x 100 = 2145%
Formula
Percentage change = [(449 - 20) / 20] x 100
Subtract the new number by the original number
449 - 20 = 429
429 ÷ 20 = 21.45
21.45 x 100 = 2145%
Example