-15.84% is the change from 770 to 648
Calculation steps:
[( 648 - 770 ) ÷ 770] x 100 = -15.84%
Formula
Percentage change = [(648 - 770) / 770] x 100
Subtract the new number by the original number
648 - 770 = -122
-122 ÷ 770 = -0.15844155844155844
-0.15844155844155844 x 100 = -15.84%