-33.79% is the change from 512 to 339
Calculation steps:
[( 339 - 512 ) ÷ 512] x 100 = -33.79%
Formula
Percentage change = [(339 - 512) / 512] x 100
Subtract the new number by the original number
339 - 512 = -173
-173 ÷ 512 = -0.337890625
-0.337890625 x 100 = -33.79%