When you want to calculate the percentage "a" (11, in this case) is of "b" (50, in this case), divide a by b, and multiply that value by 100%.
So, to calculate what percent 11 is of 50, divide 11 by 50 and multiply that decimal by 100%:
[tex] \frac{11}{50} \times 100\% = 0.22 \times 100\% = 22\%[/tex]
