-50% is the change from 448 to 224
Calculation steps:
[( 224 - 448 ) ÷ 448] x 100 = -50%
Formula
Percentage change = [(224 - 448) / 448] x 100
Subtract the new number by the original number
224 - 448 = -224
-224 ÷ 448 = -0.5
-0.5 x 100 = -50%
Example