-55.15% is the change from 515 to 231
Calculation steps:
[( 231 - 515 ) ÷ 515] x 100 = -55.15%
Formula
Percentage change = [(231 - 515) / 515] x 100
Subtract the new number by the original number
231 - 515 = -284
-284 ÷ 515 = -0.5514563106796116
-0.5514563106796116 x 100 = -55.15%