-67.9% is the change from 810 to 260
Calculation steps:
[( 260 - 810 ) ÷ 810] x 100 = -67.9%
Formula
Percentage change = [(260 - 810) / 810] x 100
Subtract the new number by the original number
260 - 810 = -550
-550 ÷ 810 = -0.6790123456790124
-0.6790123456790124 x 100 = -67.9%