-45.78% is the change from 509 to 276
Calculation steps:
[( 276 - 509 ) ÷ 509] x 100 = -45.78%
Formula
Percentage change = [(276 - 509) / 509] x 100
Subtract the new number by the original number
276 - 509 = -233
-233 ÷ 509 = -0.4577603143418468
-0.4577603143418468 x 100 = -45.78%