-20.99% is the change from 848 to 670
Calculation steps:
[( 670 - 848 ) ÷ 848] x 100 = -20.99%
Formula
Percentage change = [(670 - 848) / 848] x 100
Subtract the new number by the original number
670 - 848 = -178
-178 ÷ 848 = -0.2099056603773585
-0.2099056603773585 x 100 = -20.99%