-7.87% is the change from 902 to 831
Calculation steps:
[( 831 - 902 ) ÷ 902] x 100 = -7.87%
Formula
Percentage change = [(831 - 902) / 902] x 100
Subtract the new number by the original number
831 - 902 = -71
-71 ÷ 902 = -0.0787139689578714
-0.0787139689578714 x 100 = -7.87%