-81.63% is the change from 98 to 18
Calculation steps:
[( 18 - 98 ) ÷ 98] x 100 = -81.63%
Formula
Percentage change = [(18 - 98) / 98] x 100
Subtract the new number by the original number
18 - 98 = -80
-80 ÷ 98 = -0.8163265306122449
-0.8163265306122449 x 100 = -81.63%