-46.43% is the change from 840 to 450
Calculation steps:
[( 450 - 840 ) ÷ 840] x 100 = -46.43%
Formula
Percentage change = [(450 - 840) / 840] x 100
Subtract the new number by the original number
450 - 840 = -390
-390 ÷ 840 = -0.4642857142857143
-0.4642857142857143 x 100 = -46.43%