30.77% is the change from 13 to 17
Calculation steps:
[( 17 - 13 ) ÷ 13] x 100 = 30.77%
Formula
Percentage change = [(17 - 13) / 13] x 100
Subtract the new number by the original number
17 - 13 = 4
4 ÷ 13 = 0.3076923076923077
0.3076923076923077 x 100 = 30.77%