-92.51% is the change from 668 to 50
Calculation steps:
[( 50 - 668 ) ÷ 668] x 100 = -92.51%
Formula
Percentage change = [(50 - 668) / 668] x 100
Subtract the new number by the original number
50 - 668 = -618
-618 ÷ 668 = -0.9251497005988024
-0.9251497005988024 x 100 = -92.51%