73.33% is the change from 15 to 26
Calculation steps:
[( 26 - 15 ) ÷ 15] x 100 = 73.33%
Formula
Percentage change = [(26 - 15) / 15] x 100
Subtract the new number by the original number
26 - 15 = 11
11 ÷ 15 = 0.7333333333333333
0.7333333333333333 x 100 = 73.33%