-15.22% is the change from 920 to 780
Calculation steps:
[( 780 - 920 ) ÷ 920] x 100 = -15.22%
Formula
Percentage change = [(780 - 920) / 920] x 100
Subtract the new number by the original number
780 - 920 = -140
-140 ÷ 920 = -0.15217391304347827
-0.15217391304347827 x 100 = -15.22%