-7.08% is the change from 904 to 840
Calculation steps:
[( 840 - 904 ) ÷ 904] x 100 = -7.08%
Formula
Percentage change = [(840 - 904) / 904] x 100
Subtract the new number by the original number
840 - 904 = -64
-64 ÷ 904 = -0.07079646017699115
-0.07079646017699115 x 100 = -7.08%