-47.43% is the change from 643 to 338
Calculation steps:
[( 338 - 643 ) ÷ 643] x 100 = -47.43%
Formula
Percentage change = [(338 - 643) / 643] x 100
Subtract the new number by the original number
338 - 643 = -305
-305 ÷ 643 = -0.47433903576982894
-0.47433903576982894 x 100 = -47.43%