Advertising in a magazine costs ₹$1472\dfrac{2}{5}$ per square inch. Find the cost of an advertisement of $17\dfrac{6}{7}$ square inch.

Cost of an advertisement of 1 square inch = ₹$1472\dfrac{2}{5} = ₹\dfrac{7362}{5}$

Cost of an advertisement of $17\dfrac{6}{7}$ square inch = ?

Area of an advertisement = $17\dfrac{6}{7}$ square inch

Cost of an advertisement of $17\dfrac{6}{7}$ square inch = (Cost of an advertisement of 1 square inch) x (Area of an advertisement)

Substituting the values in above, we get:

$\begin{array}{ll} = ₹\Big(\dfrac{7362}{5} \times 17\dfrac{6}{7}\Big) \\ = ₹\Big(\dfrac{7362}{5} \times \dfrac{125}{7}\Big) & \text{[Converting mixed to improper fraction]} \\ = ₹\Big(\dfrac{7362}{1} \times \dfrac{25}{7}\Big) \\ = ₹\Big(\dfrac{7362 \times 25}{1 \times 7}\Big) \\ = ₹\dfrac{184050}{7} \\ = ₹26292 \dfrac{6}{7} & \text{[Converting improper fraction to mixed fraction]} \end{array}$

∴ The cost of an advertisement of $17\dfrac{6}{7}$ square inch = ₹ $26292\dfrac{6}{7}$.