-20.15% is the change from 804 to 642
Calculation steps:
[( 642 - 804 ) ÷ 804] x 100 = -20.15%
Formula
Percentage change = [(642 - 804) / 804] x 100
Subtract the new number by the original number
642 - 804 = -162
-162 ÷ 804 = -0.20149253731343283
-0.20149253731343283 x 100 = -20.15%