-39.26% is the change from 512 to 311
Calculation steps:
[( 311 - 512 ) ÷ 512] x 100 = -39.26%
Formula
Percentage change = [(311 - 512) / 512] x 100
Subtract the new number by the original number
311 - 512 = -201
-201 ÷ 512 = -0.392578125
-0.392578125 x 100 = -39.26%