-2.34% is the change from 512 to 500
Calculation steps:
[( 500 - 512 ) ÷ 512] x 100 = -2.34%
Formula
Percentage change = [(500 - 512) / 512] x 100
Subtract the new number by the original number
500 - 512 = -12
-12 ÷ 512 = -0.0234375
-0.0234375 x 100 = -2.34%