-92.38% is the change from 643 to 49
Calculation steps:
[( 49 - 643 ) ÷ 643] x 100 = -92.38%
Formula
Percentage change = [(49 - 643) / 643] x 100
Subtract the new number by the original number
49 - 643 = -594
-594 ÷ 643 = -0.9237947122861586
-0.9237947122861586 x 100 = -92.38%