-98.62% is the change from 508 to 7
Calculation steps:
[( 7 - 508 ) ÷ 508] x 100 = -98.62%
Formula
Percentage change = [(7 - 508) / 508] x 100
Subtract the new number by the original number
7 - 508 = -501
-501 ÷ 508 = -0.9862204724409449
-0.9862204724409449 x 100 = -98.62%