38.1% is the change from 21 to 29
Calculation steps:
[( 29 - 21 ) ÷ 21] x 100 = 38.1%
Formula
Percentage change = [(29 - 21) / 21] x 100
Subtract the new number by the original number
29 - 21 = 8
8 ÷ 21 = 0.38095238095238093
0.38095238095238093 x 100 = 38.1%