-24.25% is the change from 668 to 506
Calculation steps:
[( 506 - 668 ) ÷ 668] x 100 = -24.25%
Formula
Percentage change = [(506 - 668) / 668] x 100
Subtract the new number by the original number
506 - 668 = -162
-162 ÷ 668 = -0.24251497005988024
-0.24251497005988024 x 100 = -24.25%