-90.02% is the change from 842 to 84
Calculation steps:
[( 84 - 842 ) ÷ 842] x 100 = -90.02%
Formula
Percentage change = [(84 - 842) / 842] x 100
Subtract the new number by the original number
84 - 842 = -758
-758 ÷ 842 = -0.9002375296912114
-0.9002375296912114 x 100 = -90.02%