-52.85% is the change from 509 to 240
Calculation steps:
[( 240 - 509 ) ÷ 509] x 100 = -52.85%
Formula
Percentage change = [(240 - 509) / 509] x 100
Subtract the new number by the original number
240 - 509 = -269
-269 ÷ 509 = -0.5284872298624754
-0.5284872298624754 x 100 = -52.85%