-48.04% is the change from 510 to 265
Calculation steps:
[( 265 - 510 ) ÷ 510] x 100 = -48.04%
Formula
Percentage change = [(265 - 510) / 510] x 100
Subtract the new number by the original number
265 - 510 = -245
-245 ÷ 510 = -0.4803921568627451
-0.4803921568627451 x 100 = -48.04%