-0.79% is the change from 506 to 502
Calculation steps:
[( 502 - 506 ) ÷ 506] x 100 = -0.79%
Formula
Percentage change = [(502 - 506) / 506] x 100
Subtract the new number by the original number
502 - 506 = -4
-4 ÷ 506 = -0.007905138339920948
-0.007905138339920948 x 100 = -0.79%