-45.83% is the change from 515 to 279
Calculation steps:
[( 279 - 515 ) ÷ 515] x 100 = -45.83%
Formula
Percentage change = [(279 - 515) / 515] x 100
Subtract the new number by the original number
279 - 515 = -236
-236 ÷ 515 = -0.458252427184466
-0.458252427184466 x 100 = -45.83%