-16.4% is the change from 500 to 418
Calculation steps:
[( 418 - 500 ) ÷ 500] x 100 = -16.4%
Formula
Percentage change = [(418 - 500) / 500] x 100
Subtract the new number by the original number
418 - 500 = -82
-82 ÷ 500 = -0.164
-0.164 x 100 = -16.4%