-70.55% is the change from 815 to 240
Calculation steps:
[( 240 - 815 ) ÷ 815] x 100 = -70.55%
Formula
Percentage change = [(240 - 815) / 815] x 100
Subtract the new number by the original number
240 - 815 = -575
-575 ÷ 815 = -0.7055214723926381
-0.7055214723926381 x 100 = -70.55%