-97.36% is the change from 493 to 13
Calculation steps:
[( 13 - 493 ) ÷ 493] x 100 = -97.36%
Formula
Percentage change = [(13 - 493) / 493] x 100
Subtract the new number by the original number
13 - 493 = -480
-480 ÷ 493 = -0.973630831643002
-0.973630831643002 x 100 = -97.36%