16.62% is the change from 343 to 400
Calculation steps:
[( 400 - 343 ) ÷ 343] x 100 = 16.62%
Formula
Percentage change = [(400 - 343) / 343] x 100
Subtract the new number by the original number
400 - 343 = 57
57 ÷ 343 = 0.1661807580174927
0.1661807580174927 x 100 = 16.62%