-21.02% is the change from 842 to 665
Calculation steps:
[( 665 - 842 ) ÷ 842] x 100 = -21.02%
Formula
Percentage change = [(665 - 842) / 842] x 100
Subtract the new number by the original number
665 - 842 = -177
-177 ÷ 842 = -0.21021377672209027
-0.21021377672209027 x 100 = -21.02%