17.5% is the change from 280 to 329
Calculation steps:
[( 329 - 280 ) ÷ 280] x 100 = 17.5%
Formula
Percentage change = [(329 - 280) / 280] x 100
Subtract the new number by the original number
329 - 280 = 49
49 ÷ 280 = 0.175
0.175 x 100 = 17.5%
Example