-31.7% is the change from 448 to 306
Calculation steps:
[( 306 - 448 ) ÷ 448] x 100 = -31.7%
Formula
Percentage change = [(306 - 448) / 448] x 100
Subtract the new number by the original number
306 - 448 = -142
-142 ÷ 448 = -0.3169642857142857
-0.3169642857142857 x 100 = -31.7%