-14.45% is the change from 512 to 438
Calculation steps:
[( 438 - 512 ) ÷ 512] x 100 = -14.45%
Formula
Percentage change = [(438 - 512) / 512] x 100
Subtract the new number by the original number
438 - 512 = -74
-74 ÷ 512 = -0.14453125
-0.14453125 x 100 = -14.45%