-18.01% is the change from 783 to 642
Calculation steps:
[( 642 - 783 ) ÷ 783] x 100 = -18.01%
Formula
Percentage change = [(642 - 783) / 783] x 100
Subtract the new number by the original number
642 - 783 = -141
-141 ÷ 783 = -0.18007662835249041
-0.18007662835249041 x 100 = -18.01%