-80.75% is the change from 509 to 98
Calculation steps:
[( 98 - 509 ) ÷ 509] x 100 = -80.75%
Formula
Percentage change = [(98 - 509) / 509] x 100
Subtract the new number by the original number
98 - 509 = -411
-411 ÷ 509 = -0.8074656188605108
-0.8074656188605108 x 100 = -80.75%