-90.81% is the change from 849 to 78
Calculation steps:
[( 78 - 849 ) ÷ 849] x 100 = -90.81%
Formula
Percentage change = [(78 - 849) / 849] x 100
Subtract the new number by the original number
78 - 849 = -771
-771 ÷ 849 = -0.9081272084805654
-0.9081272084805654 x 100 = -90.81%