-51.71% is the change from 497 to 240
Calculation steps:
[( 240 - 497 ) ÷ 497] x 100 = -51.71%
Formula
Percentage change = [(240 - 497) / 497] x 100
Subtract the new number by the original number
240 - 497 = -257
-257 ÷ 497 = -0.5171026156941649
-0.5171026156941649 x 100 = -51.71%