-44.99% is the change from 509 to 280
Calculation steps:
[( 280 - 509 ) ÷ 509] x 100 = -44.99%
Formula
Percentage change = [(280 - 509) / 509] x 100
Subtract the new number by the original number
280 - 509 = -229
-229 ÷ 509 = -0.449901768172888
-0.449901768172888 x 100 = -44.99%