-48.9% is the change from 501 to 256
Calculation steps:
[( 256 - 501 ) ÷ 501] x 100 = -48.9%
Formula
Percentage change = [(256 - 501) / 501] x 100
Subtract the new number by the original number
256 - 501 = -245
-245 ÷ 501 = -0.48902195608782434
-0.48902195608782434 x 100 = -48.9%