-50.68% is the change from 515 to 254
Calculation steps:
[( 254 - 515 ) ÷ 515] x 100 = -50.68%
Formula
Percentage change = [(254 - 515) / 515] x 100
Subtract the new number by the original number
254 - 515 = -261
-261 ÷ 515 = -0.5067961165048543
-0.5067961165048543 x 100 = -50.68%