-43.16% is the change from 512 to 291
Calculation steps:
[( 291 - 512 ) ÷ 512] x 100 = -43.16%
Formula
Percentage change = [(291 - 512) / 512] x 100
Subtract the new number by the original number
291 - 512 = -221
-221 ÷ 512 = -0.431640625
-0.431640625 x 100 = -43.16%