Answer :

TSO
[tex]15 = \frac{x}{100} \times 165[/tex]

[tex] \frac{15}{165}= \frac{x}{100} [/tex]

[tex]x = \frac{15 \times 100}{165} [/tex]

[tex]x= \frac{100}{11} [/tex]

[tex] \frac{100}{11} = 9.09[/tex]

So your answer is 9.09%
ratio and proportion 15/165=x/100 cross multiply x=9.09%