-20.25% is the change from 805 to 642
Calculation steps:
[( 642 - 805 ) ÷ 805] x 100 = -20.25%
Formula
Percentage change = [(642 - 805) / 805] x 100
Subtract the new number by the original number
642 - 805 = -163
-163 ÷ 805 = -0.20248447204968945
-0.20248447204968945 x 100 = -20.25%