-17.74% is the change from 840 to 691
Calculation steps:
[( 691 - 840 ) ÷ 840] x 100 = -17.74%
Formula
Percentage change = [(691 - 840) / 840] x 100
Subtract the new number by the original number
691 - 840 = -149
-149 ÷ 840 = -0.1773809523809524
-0.1773809523809524 x 100 = -17.74%