-70.99% is the change from 810 to 235
Calculation steps:
[( 235 - 810 ) ÷ 810] x 100 = -70.99%
Formula
Percentage change = [(235 - 810) / 810] x 100
Subtract the new number by the original number
235 - 810 = -575
-575 ÷ 810 = -0.7098765432098766
-0.7098765432098766 x 100 = -70.99%