-91.33% is the change from 450 to 39
Calculation steps:
[( 39 - 450 ) ÷ 450] x 100 = -91.33%
Formula
Percentage change = [(39 - 450) / 450] x 100
Subtract the new number by the original number
39 - 450 = -411
-411 ÷ 450 = -0.9133333333333333
-0.9133333333333333 x 100 = -91.33%