-88.32% is the change from 668 to 78
Calculation steps:
[( 78 - 668 ) ÷ 668] x 100 = -88.32%
Formula
Percentage change = [(78 - 668) / 668] x 100
Subtract the new number by the original number
78 - 668 = -590
-590 ÷ 668 = -0.8832335329341318
-0.8832335329341318 x 100 = -88.32%