-62.02% is the change from 840 to 319
Calculation steps:
[( 319 - 840 ) ÷ 840] x 100 = -62.02%
Formula
Percentage change = [(319 - 840) / 840] x 100
Subtract the new number by the original number
319 - 840 = -521
-521 ÷ 840 = -0.6202380952380953
-0.6202380952380953 x 100 = -62.02%