-91.21% is the change from 899 to 79
Calculation steps:
[( 79 - 899 ) ÷ 899] x 100 = -91.21%
Formula
Percentage change = [(79 - 899) / 899] x 100
Subtract the new number by the original number
79 - 899 = -820
-820 ÷ 899 = -0.9121245828698554
-0.9121245828698554 x 100 = -91.21%