-34.47% is the change from 647 to 424
Calculation steps:
[( 424 - 647 ) ÷ 647] x 100 = -34.47%
Formula
Percentage change = [(424 - 647) / 647] x 100
Subtract the new number by the original number
424 - 647 = -223
-223 ÷ 647 = -0.3446676970633694
-0.3446676970633694 x 100 = -34.47%