-27.17% is the change from 920 to 670
Calculation steps:
[( 670 - 920 ) ÷ 920] x 100 = -27.17%
Formula
Percentage change = [(670 - 920) / 920] x 100
Subtract the new number by the original number
670 - 920 = -250
-250 ÷ 920 = -0.2717391304347826
-0.2717391304347826 x 100 = -27.17%