-66.75% is the change from 770 to 256
Calculation steps:
[( 256 - 770 ) ÷ 770] x 100 = -66.75%
Formula
Percentage change = [(256 - 770) / 770] x 100
Subtract the new number by the original number
256 - 770 = -514
-514 ÷ 770 = -0.6675324675324675
-0.6675324675324675 x 100 = -66.75%