-97.41% is the change from 502 to 13
Calculation steps:
[( 13 - 502 ) ÷ 502] x 100 = -97.41%
Formula
Percentage change = [(13 - 502) / 502] x 100
Subtract the new number by the original number
13 - 502 = -489
-489 ÷ 502 = -0.9741035856573705
-0.9741035856573705 x 100 = -97.41%