-55% is the change from 1000 to 450
Calculation steps:
[( 450 - 1000 ) ÷ 1000] x 100 = -55%
Formula
Percentage change = [(450 - 1000) / 1000] x 100
Subtract the new number by the original number
450 - 1000 = -550
-550 ÷ 1000 = -0.55
-0.55 x 100 = -55%