-65.68% is the change from 810 to 278
Calculation steps:
[( 278 - 810 ) ÷ 810] x 100 = -65.68%
Formula
Percentage change = [(278 - 810) / 810] x 100
Subtract the new number by the original number
278 - 810 = -532
-532 ÷ 810 = -0.6567901234567901
-0.6567901234567901 x 100 = -65.68%