-6.31% is the change from 840 to 787
Calculation steps:
[( 787 - 840 ) ÷ 840] x 100 = -6.31%
Formula
Percentage change = [(787 - 840) / 840] x 100
Subtract the new number by the original number
787 - 840 = -53
-53 ÷ 840 = -0.0630952380952381
-0.0630952380952381 x 100 = -6.31%