26.7% is the change from 397 to 503
Calculation steps:
[( 503 - 397 ) ÷ 397] x 100 = 26.7%
Formula
Percentage change = [(503 - 397) / 397] x 100
Subtract the new number by the original number
503 - 397 = 106
106 ÷ 397 = 0.26700251889168763
0.26700251889168763 x 100 = 26.7%