-92.37% is the change from 642 to 49
Calculation steps:
[( 49 - 642 ) ÷ 642] x 100 = -92.37%
Formula
Percentage change = [(49 - 642) / 642] x 100
Subtract the new number by the original number
49 - 642 = -593
-593 ÷ 642 = -0.9236760124610592
-0.9236760124610592 x 100 = -92.37%