-93.47% is the change from 643 to 42
Calculation steps:
[( 42 - 643 ) ÷ 643] x 100 = -93.47%
Formula
Percentage change = [(42 - 643) / 643] x 100
Subtract the new number by the original number
42 - 643 = -601
-601 ÷ 643 = -0.9346811819595645
-0.9346811819595645 x 100 = -93.47%