-62.26% is the change from 840 to 317
Calculation steps:
[( 317 - 840 ) ÷ 840] x 100 = -62.26%
Formula
Percentage change = [(317 - 840) / 840] x 100
Subtract the new number by the original number
317 - 840 = -523
-523 ÷ 840 = -0.6226190476190476
-0.6226190476190476 x 100 = -62.26%