-66.71% is the change from 835 to 278
Calculation steps:
[( 278 - 835 ) ÷ 835] x 100 = -66.71%
Formula
Percentage change = [(278 - 835) / 835] x 100
Subtract the new number by the original number
278 - 835 = -557
-557 ÷ 835 = -0.667065868263473
-0.667065868263473 x 100 = -66.71%