21.84% is the change from 261 to 318
Calculation steps:
[( 318 - 261 ) ÷ 261] x 100 = 21.84%
Formula
Percentage change = [(318 - 261) / 261] x 100
Subtract the new number by the original number
318 - 261 = 57
57 ÷ 261 = 0.21839080459770116
0.21839080459770116 x 100 = 21.84%