-1.95% is the change from 512 to 502
Calculation steps:
[( 502 - 512 ) ÷ 512] x 100 = -1.95%
Formula
Percentage change = [(502 - 512) / 512] x 100
Subtract the new number by the original number
502 - 512 = -10
-10 ÷ 512 = -0.01953125
-0.01953125 x 100 = -1.95%