30.59% is the change from 304 to 397
Calculation steps:
[( 397 - 304 ) ÷ 304] x 100 = 30.59%
Formula
Percentage change = [(397 - 304) / 304] x 100
Subtract the new number by the original number
397 - 304 = 93
93 ÷ 304 = 0.3059210526315789
0.3059210526315789 x 100 = 30.59%