-90.09% is the change from 848 to 84
Calculation steps:
[( 84 - 848 ) ÷ 848] x 100 = -90.09%
Formula
Percentage change = [(84 - 848) / 848] x 100
Subtract the new number by the original number
84 - 848 = -764
-764 ÷ 848 = -0.9009433962264151
-0.9009433962264151 x 100 = -90.09%