4890% is the change from 20 to 998
Calculation steps:
[( 998 - 20 ) ÷ 20] x 100 = 4890%
Formula
Percentage change = [(998 - 20) / 20] x 100
Subtract the new number by the original number
998 - 20 = 978
978 ÷ 20 = 48.9
48.9 x 100 = 4890%
Example