-40.91% is the change from 770 to 455
Calculation steps:
[( 455 - 770 ) ÷ 770] x 100 = -40.91%
Formula
Percentage change = [(455 - 770) / 770] x 100
Subtract the new number by the original number
455 - 770 = -315
-315 ÷ 770 = -0.4090909090909091
-0.4090909090909091 x 100 = -40.91%