-71.17% is the change from 815 to 235
Calculation steps:
[( 235 - 815 ) ÷ 815] x 100 = -71.17%
Formula
Percentage change = [(235 - 815) / 815] x 100
Subtract the new number by the original number
235 - 815 = -580
-580 ÷ 815 = -0.7116564417177914
-0.7116564417177914 x 100 = -71.17%