52.87% is the change from 261 to 399
Calculation steps:
[( 399 - 261 ) ÷ 261] x 100 = 52.87%
Formula
Percentage change = [(399 - 261) / 261] x 100
Subtract the new number by the original number
399 - 261 = 138
138 ÷ 261 = 0.5287356321839081
0.5287356321839081 x 100 = 52.87%