-66.88% is the change from 773 to 256
Calculation steps:
[( 256 - 773 ) ÷ 773] x 100 = -66.88%
Formula
Percentage change = [(256 - 773) / 773] x 100
Subtract the new number by the original number
256 - 773 = -517
-517 ÷ 773 = -0.6688227684346701
-0.6688227684346701 x 100 = -66.88%