-74.92% is the change from 642 to 161
Calculation steps:
[( 161 - 642 ) ÷ 642] x 100 = -74.92%
Formula
Percentage change = [(161 - 642) / 642] x 100
Subtract the new number by the original number
161 - 642 = -481
-481 ÷ 642 = -0.7492211838006231
-0.7492211838006231 x 100 = -74.92%