-15.06% is the change from 777 to 660
Calculation steps:
[( 660 - 777 ) ÷ 777] x 100 = -15.06%
Formula
Percentage change = [(660 - 777) / 777] x 100
Subtract the new number by the original number
660 - 777 = -117
-117 ÷ 777 = -0.15057915057915058
-0.15057915057915058 x 100 = -15.06%