27.65% is the change from 311 to 397
Calculation steps:
[( 397 - 311 ) ÷ 311] x 100 = 27.65%
Formula
Percentage change = [(397 - 311) / 311] x 100
Subtract the new number by the original number
397 - 311 = 86
86 ÷ 311 = 0.2765273311897106
0.2765273311897106 x 100 = 27.65%