-47.76% is the change from 670 to 350
Calculation steps:
[( 350 - 670 ) ÷ 670] x 100 = -47.76%
Formula
Percentage change = [(350 - 670) / 670] x 100
Subtract the new number by the original number
350 - 670 = -320
-320 ÷ 670 = -0.47761194029850745
-0.47761194029850745 x 100 = -47.76%