-40.63% is the change from 512 to 304
Calculation steps:
[( 304 - 512 ) ÷ 512] x 100 = -40.63%
Formula
Percentage change = [(304 - 512) / 512] x 100
Subtract the new number by the original number
304 - 512 = -208
-208 ÷ 512 = -0.40625
-0.40625 x 100 = -40.63%