-51.76% is the change from 512 to 247
Calculation steps:
[( 247 - 512 ) ÷ 512] x 100 = -51.76%
Formula
Percentage change = [(247 - 512) / 512] x 100
Subtract the new number by the original number
247 - 512 = -265
-265 ÷ 512 = -0.517578125
-0.517578125 x 100 = -51.76%