If a cloth costs ₹$715\dfrac{1}{4}$ per metre, find the cost of $3\dfrac{2}{5}$ metres of this cloth.

Cost of 1 meter of cloth = ₹$715\dfrac{1}{4} = ₹\dfrac{2861}{4}$

Cost of $3\dfrac{2}{5}$ meters of cloth = ?

Length of cloth = $3\dfrac{2}{5} \text{ meters} = \dfrac{17}{5}$ meters

Cost of $3\dfrac{2}{5}$ meters of cloth = (Cost of 1 meter of cloth) x (Length of cloth)

Substituting the values in above, we get:

$\begin{array}{ll} = ₹\Big(\dfrac{2861}{4} \times \dfrac{17}{5}\Big) \\ = ₹\Big(\dfrac{2861 \times 17}{4 \times 5}\Big) \\ = ₹\dfrac{48637}{20} \\ = ₹2431\dfrac{17}{20} & \text{[Converting improper to mixed fraction]} \end{array}$

∴ The cost of $3\dfrac{2}{5}$ meters of cloth = ₹ $2431\dfrac{17}{20}$.