49.25% is the change from 266 to 397
Calculation steps:
[( 397 - 266 ) ÷ 266] x 100 = 49.25%
Formula
Percentage change = [(397 - 266) / 266] x 100
Subtract the new number by the original number
397 - 266 = 131
131 ÷ 266 = 0.4924812030075188
0.4924812030075188 x 100 = 49.25%