2040% is the change from 20 to 428
Calculation steps:
[( 428 - 20 ) ÷ 20] x 100 = 2040%
Formula
Percentage change = [(428 - 20) / 20] x 100
Subtract the new number by the original number
428 - 20 = 408
408 ÷ 20 = 20.4
20.4 x 100 = 2040%
Example