-28.57% is the change from 938 to 670
Calculation steps:
[( 670 - 938 ) ÷ 938] x 100 = -28.57%
Formula
Percentage change = [(670 - 938) / 938] x 100
Subtract the new number by the original number
670 - 938 = -268
-268 ÷ 938 = -0.2857142857142857
-0.2857142857142857 x 100 = -28.57%