-36.12% is the change from 670 to 428
Calculation steps:
[( 428 - 670 ) ÷ 670] x 100 = -36.12%
Formula
Percentage change = [(428 - 670) / 670] x 100
Subtract the new number by the original number
428 - 670 = -242
-242 ÷ 670 = -0.3611940298507463
-0.3611940298507463 x 100 = -36.12%