-49.02% is the change from 512 to 261
Calculation steps:
[( 261 - 512 ) ÷ 512] x 100 = -49.02%
Formula
Percentage change = [(261 - 512) / 512] x 100
Subtract the new number by the original number
261 - 512 = -251
-251 ÷ 512 = -0.490234375
-0.490234375 x 100 = -49.02%