-51.87% is the change from 509 to 245
Calculation steps:
[( 245 - 509 ) ÷ 509] x 100 = -51.87%
Formula
Percentage change = [(245 - 509) / 509] x 100
Subtract the new number by the original number
245 - 509 = -264
-264 ÷ 509 = -0.518664047151277
-0.518664047151277 x 100 = -51.87%