33.98% is the change from 256 to 343
Calculation steps:
[( 343 - 256 ) ÷ 256] x 100 = 33.98%
Formula
Percentage change = [(343 - 256) / 256] x 100
Subtract the new number by the original number
343 - 256 = 87
87 ÷ 256 = 0.33984375
0.33984375 x 100 = 33.98%