8.57% is the change from 210 to 228
Calculation steps:
[( 228 - 210 ) ÷ 210] x 100 = 8.57%
Formula
Percentage change = [(228 - 210) / 210] x 100
Subtract the new number by the original number
228 - 210 = 18
18 ÷ 210 = 0.08571428571428572
0.08571428571428572 x 100 = 8.57%