-27.92% is the change from 770 to 555
Calculation steps:
[( 555 - 770 ) ÷ 770] x 100 = -27.92%
Formula
Percentage change = [(555 - 770) / 770] x 100
Subtract the new number by the original number
555 - 770 = -215
-215 ÷ 770 = -0.2792207792207792
-0.2792207792207792 x 100 = -27.92%