-22.51% is the change from 835 to 647
Calculation steps:
[( 647 - 835 ) ÷ 835] x 100 = -22.51%
Formula
Percentage change = [(647 - 835) / 835] x 100
Subtract the new number by the original number
647 - 835 = -188
-188 ÷ 835 = -0.2251497005988024
-0.2251497005988024 x 100 = -22.51%