-9.09% is the change from 924 to 840
Calculation steps:
[( 840 - 924 ) ÷ 924] x 100 = -9.09%
Formula
Percentage change = [(840 - 924) / 924] x 100
Subtract the new number by the original number
840 - 924 = -84
-84 ÷ 924 = -0.09090909090909091
-0.09090909090909091 x 100 = -9.09%