2350% is the change from 20 to 490
Calculation steps:
[( 490 - 20 ) ÷ 20] x 100 = 2350%
Formula
Percentage change = [(490 - 20) / 20] x 100
Subtract the new number by the original number
490 - 20 = 470
470 ÷ 20 = 23.5
23.5 x 100 = 2350%
Example