-21.55% is the change from 840 to 659
Calculation steps:
[( 659 - 840 ) ÷ 840] x 100 = -21.55%
Formula
Percentage change = [(659 - 840) / 840] x 100
Subtract the new number by the original number
659 - 840 = -181
-181 ÷ 840 = -0.2154761904761905
-0.2154761904761905 x 100 = -21.55%