-41.55% is the change from 840 to 491
Calculation steps:
[( 491 - 840 ) ÷ 840] x 100 = -41.55%
Formula
Percentage change = [(491 - 840) / 840] x 100
Subtract the new number by the original number
491 - 840 = -349
-349 ÷ 840 = -0.4154761904761905
-0.4154761904761905 x 100 = -41.55%