-51.07% is the change from 840 to 411
Calculation steps:
[( 411 - 840 ) ÷ 840] x 100 = -51.07%
Formula
Percentage change = [(411 - 840) / 840] x 100
Subtract the new number by the original number
411 - 840 = -429
-429 ÷ 840 = -0.5107142857142857
-0.5107142857142857 x 100 = -51.07%