-42.14% is the change from 840 to 486
Calculation steps:
[( 486 - 840 ) ÷ 840] x 100 = -42.14%
Formula
Percentage change = [(486 - 840) / 840] x 100
Subtract the new number by the original number
486 - 840 = -354
-354 ÷ 840 = -0.42142857142857143
-0.42142857142857143 x 100 = -42.14%