-84.74% is the change from 642 to 98
Calculation steps:
[( 98 - 642 ) ÷ 642] x 100 = -84.74%
Formula
Percentage change = [(98 - 642) / 642] x 100
Subtract the new number by the original number
98 - 642 = -544
-544 ÷ 642 = -0.8473520249221184
-0.8473520249221184 x 100 = -84.74%