-67.1% is the change from 778 to 256
Calculation steps:
[( 256 - 778 ) ÷ 778] x 100 = -67.1%
Formula
Percentage change = [(256 - 778) / 778] x 100
Subtract the new number by the original number
256 - 778 = -522
-522 ÷ 778 = -0.6709511568123393
-0.6709511568123393 x 100 = -67.1%