Three friends arranged a party. Tanveer paid \( \frac{2}{3} \) as much as Yusuf paid. Yusuf paid \( \frac{1}{2} \) as much as Sachin paid. The fraction of the total expenditure by Yusuf was:
\( \frac{2}{11} \)
\( \frac{3}{11} \)
\( \frac{7}{11} \)
\( \frac{5}{11} \)
Simplify: \( 1.8 + 2 \times \frac{3}{2} \times \frac{1}{2}\left\{ \frac{2}{5} \div \left( \frac{3}{5} \times \frac{2}{3} \right) \times \frac{3}{2} - 1 \right\} \)