-9.62% is the change from 915 to 827
Calculation steps:
[( 827 - 915 ) ÷ 915] x 100 = -9.62%
Formula
Percentage change = [(827 - 915) / 915] x 100
Subtract the new number by the original number
827 - 915 = -88
-88 ÷ 915 = -0.09617486338797815
-0.09617486338797815 x 100 = -9.62%