-42.19% is the change from 512 to 296
Calculation steps:
[( 296 - 512 ) ÷ 512] x 100 = -42.19%
Formula
Percentage change = [(296 - 512) / 512] x 100
Subtract the new number by the original number
296 - 512 = -216
-216 ÷ 512 = -0.421875
-0.421875 x 100 = -42.19%