-97.45% is the change from 510 to 13
Calculation steps:
[( 13 - 510 ) ÷ 510] x 100 = -97.45%
Formula
Percentage change = [(13 - 510) / 510] x 100
Subtract the new number by the original number
13 - 510 = -497
-497 ÷ 510 = -0.9745098039215686
-0.9745098039215686 x 100 = -97.45%