-70.31% is the change from 815 to 242
Calculation steps:
[( 242 - 815 ) ÷ 815] x 100 = -70.31%
Formula
Percentage change = [(242 - 815) / 815] x 100
Subtract the new number by the original number
242 - 815 = -573
-573 ÷ 815 = -0.7030674846625767
-0.7030674846625767 x 100 = -70.31%