-9.75% is the change from 913 to 824
Calculation steps:
[( 824 - 913 ) ÷ 913] x 100 = -9.75%
Formula
Percentage change = [(824 - 913) / 913] x 100
Subtract the new number by the original number
824 - 913 = -89
-89 ÷ 913 = -0.09748083242059145
-0.09748083242059145 x 100 = -9.75%