-13.11% is the change from 450 to 391
Calculation steps:
[( 391 - 450 ) ÷ 450] x 100 = -13.11%
Formula
Percentage change = [(391 - 450) / 450] x 100
Subtract the new number by the original number
391 - 450 = -59
-59 ÷ 450 = -0.13111111111111112
-0.13111111111111112 x 100 = -13.11%