-9.97% is the change from 642 to 578
Calculation steps:
[( 578 - 642 ) ÷ 642] x 100 = -9.97%
Formula
Percentage change = [(578 - 642) / 642] x 100
Subtract the new number by the original number
578 - 642 = -64
-64 ÷ 642 = -0.09968847352024922
-0.09968847352024922 x 100 = -9.97%