-90.45% is the change from 838 to 80
Calculation steps:
[( 80 - 838 ) ÷ 838] x 100 = -90.45%
Formula
Percentage change = [(80 - 838) / 838] x 100
Subtract the new number by the original number
80 - 838 = -758
-758 ÷ 838 = -0.9045346062052506
-0.9045346062052506 x 100 = -90.45%