-15.17% is the change from 778 to 660
Calculation steps:
[( 660 - 778 ) ÷ 778] x 100 = -15.17%
Formula
Percentage change = [(660 - 778) / 778] x 100
Subtract the new number by the original number
660 - 778 = -118
-118 ÷ 778 = -0.15167095115681234
-0.15167095115681234 x 100 = -15.17%