-48.82% is the change from 510 to 261
Calculation steps:
[( 261 - 510 ) ÷ 510] x 100 = -48.82%
Formula
Percentage change = [(261 - 510) / 510] x 100
Subtract the new number by the original number
261 - 510 = -249
-249 ÷ 510 = -0.48823529411764705
-0.48823529411764705 x 100 = -48.82%