-88.34% is the change from 669 to 78
Calculation steps:
[( 78 - 669 ) ÷ 669] x 100 = -88.34%
Formula
Percentage change = [(78 - 669) / 669] x 100
Subtract the new number by the original number
78 - 669 = -591
-591 ÷ 669 = -0.8834080717488789
-0.8834080717488789 x 100 = -88.34%