31.42% is the change from 261 to 343
Calculation steps:
[( 343 - 261 ) ÷ 261] x 100 = 31.42%
Formula
Percentage change = [(343 - 261) / 261] x 100
Subtract the new number by the original number
343 - 261 = 82
82 ÷ 261 = 0.31417624521072796
0.31417624521072796 x 100 = 31.42%