If $\frac{4}{5}$ meter cloth costs $Rs.36$, find the cost of $2\frac{1}{5}$ meter of cloth.

$\because \frac{4}{5}$ meter cloth costs $=Rs.36$

$\therefore 1$ meter cloth costs $=Rs.36\times \frac{5}{4}=Rs.45$

Hence, $\frac{11}{5}$ meter cloth costs $=Rs.45\times \frac{11}{5}=Rs.99.$ $[\because 2\frac{1}{5}=\frac{11}{5}]$

This is the required solution.