17.06% is the change from 340 to 398
Calculation steps:
[( 398 - 340 ) ÷ 340] x 100 = 17.06%
Formula
Percentage change = [(398 - 340) / 340] x 100
Subtract the new number by the original number
398 - 340 = 58
58 ÷ 340 = 0.17058823529411765
0.17058823529411765 x 100 = 17.06%