-97.47% is the change from 790 to 20
Calculation steps:
[( 20 - 790 ) ÷ 790] x 100 = -97.47%
Formula
Percentage change = [(20 - 790) / 790] x 100
Subtract the new number by the original number
20 - 790 = -770
-770 ÷ 790 = -0.9746835443037974
-0.9746835443037974 x 100 = -97.47%