-0.71% is the change from 846 to 840
Calculation steps:
[( 840 - 846 ) ÷ 846] x 100 = -0.71%
Formula
Percentage change = [(840 - 846) / 846] x 100
Subtract the new number by the original number
840 - 846 = -6
-6 ÷ 846 = -0.0070921985815602835
-0.0070921985815602835 x 100 = -0.71%