19900% is the change from 4 to 800
Calculation steps:
[( 800 - 4 ) ÷ 4] x 100 = 19900%
Formula
Percentage change = [(800 - 4) / 4] x 100
Subtract the new number by the original number
800 - 4 = 796
796 ÷ 4 = 199
199 x 100 = 19900%
Example