-88.63% is the change from 642 to 73
Calculation steps:
[( 73 - 642 ) ÷ 642] x 100 = -88.63%
Formula
Percentage change = [(73 - 642) / 642] x 100
Subtract the new number by the original number
73 - 642 = -569
-569 ÷ 642 = -0.8862928348909658
-0.8862928348909658 x 100 = -88.63%