21.36% is the change from 337 to 409
Calculation steps:
[( 409 - 337 ) ÷ 337] x 100 = 21.36%
Formula
Percentage change = [(409 - 337) / 337] x 100
Subtract the new number by the original number
409 - 337 = 72
72 ÷ 337 = 0.21364985163204747
0.21364985163204747 x 100 = 21.36%