-97.78% is the change from 899 to 20
Calculation steps:
[( 20 - 899 ) ÷ 899] x 100 = -97.78%
Formula
Percentage change = [(20 - 899) / 899] x 100
Subtract the new number by the original number
20 - 899 = -879
-879 ÷ 899 = -0.9777530589543938
-0.9777530589543938 x 100 = -97.78%