-35.93% is the change from 668 to 428
Calculation steps:
[( 428 - 668 ) ÷ 668] x 100 = -35.93%
Formula
Percentage change = [(428 - 668) / 668] x 100
Subtract the new number by the original number
428 - 668 = -240
-240 ÷ 668 = -0.3592814371257485
-0.3592814371257485 x 100 = -35.93%