-47.68% is the change from 646 to 338
Calculation steps:
[( 338 - 646 ) ÷ 646] x 100 = -47.68%
Formula
Percentage change = [(338 - 646) / 646] x 100
Subtract the new number by the original number
338 - 646 = -308
-308 ÷ 646 = -0.47678018575851394
-0.47678018575851394 x 100 = -47.68%