-52.22% is the change from 450 to 215
Calculation steps:
[( 215 - 450 ) ÷ 450] x 100 = -52.22%
Formula
Percentage change = [(215 - 450) / 450] x 100
Subtract the new number by the original number
215 - 450 = -235
-235 ÷ 450 = -0.5222222222222223
-0.5222222222222223 x 100 = -52.22%