-47.76% is the change from 647 to 338
Calculation steps:
[( 338 - 647 ) ÷ 647] x 100 = -47.76%
Formula
Percentage change = [(338 - 647) / 647] x 100
Subtract the new number by the original number
338 - 647 = -309
-309 ÷ 647 = -0.4775888717156105
-0.4775888717156105 x 100 = -47.76%