-12.11% is the change from 512 to 450
Calculation steps:
[( 450 - 512 ) ÷ 512] x 100 = -12.11%
Formula
Percentage change = [(450 - 512) / 512] x 100
Subtract the new number by the original number
450 - 512 = -62
-62 ÷ 512 = -0.12109375
-0.12109375 x 100 = -12.11%