-24.14% is the change from 642 to 487
Calculation steps:
[( 487 - 642 ) ÷ 642] x 100 = -24.14%
Formula
Percentage change = [(487 - 642) / 642] x 100
Subtract the new number by the original number
487 - 642 = -155
-155 ÷ 642 = -0.24143302180685358
-0.24143302180685358 x 100 = -24.14%