-9.78% is the change from 450 to 406
Calculation steps:
[( 406 - 450 ) ÷ 450] x 100 = -9.78%
Formula
Percentage change = [(406 - 450) / 450] x 100
Subtract the new number by the original number
406 - 450 = -44
-44 ÷ 450 = -0.09777777777777778
-0.09777777777777778 x 100 = -9.78%