-98.62% is the change from 509 to 7
Calculation steps:
[( 7 - 509 ) ÷ 509] x 100 = -98.62%
Formula
Percentage change = [(7 - 509) / 509] x 100
Subtract the new number by the original number
7 - 509 = -502
-502 ÷ 509 = -0.9862475442043221
-0.9862475442043221 x 100 = -98.62%