-13.02% is the change from 768 to 668
Calculation steps:
[( 668 - 768 ) ÷ 768] x 100 = -13.02%
Formula
Percentage change = [(668 - 768) / 768] x 100
Subtract the new number by the original number
668 - 768 = -100
-100 ÷ 768 = -0.13020833333333334
-0.13020833333333334 x 100 = -13.02%