6.82% is the change from 220 to 235
Calculation steps:
[( 235 - 220 ) ÷ 220] x 100 = 6.82%
Formula
Percentage change = [(235 - 220) / 220] x 100
Subtract the new number by the original number
235 - 220 = 15
15 ÷ 220 = 0.06818181818181818
0.06818181818181818 x 100 = 6.82%