99.23% is the change from 261 to 520
Calculation steps:
[( 520 - 261 ) ÷ 261] x 100 = 99.23%
Formula
Percentage change = [(520 - 261) / 261] x 100
Subtract the new number by the original number
520 - 261 = 259
259 ÷ 261 = 0.9923371647509579
0.9923371647509579 x 100 = 99.23%