-97.74% is the change from 798 to 18
Calculation steps:
[( 18 - 798 ) ÷ 798] x 100 = -97.74%
Formula
Percentage change = [(18 - 798) / 798] x 100
Subtract the new number by the original number
18 - 798 = -780
-780 ÷ 798 = -0.9774436090225563
-0.9774436090225563 x 100 = -97.74%