-84.27% is the change from 642 to 101
Calculation steps:
[( 101 - 642 ) ÷ 642] x 100 = -84.27%
Formula
Percentage change = [(101 - 642) / 642] x 100
Subtract the new number by the original number
101 - 642 = -541
-541 ÷ 642 = -0.8426791277258567
-0.8426791277258567 x 100 = -84.27%