-6.6% is the change from 940 to 878
Calculation steps:
[( 878 - 940 ) ÷ 940] x 100 = -6.6%
Formula
Percentage change = [(878 - 940) / 940] x 100
Subtract the new number by the original number
878 - 940 = -62
-62 ÷ 940 = -0.06595744680851064
-0.06595744680851064 x 100 = -6.6%