-4.57% is the change from 920 to 878
Calculation steps:
[( 878 - 920 ) ÷ 920] x 100 = -4.57%
Formula
Percentage change = [(878 - 920) / 920] x 100
Subtract the new number by the original number
878 - 920 = -42
-42 ÷ 920 = -0.04565217391304348
-0.04565217391304348 x 100 = -4.57%