Mathematics

Problem

A wooden box is a cuboid measuring

50\,\text{cm} \times 30\,\text{cm} \times 20\,\text{cm}

. The top and bottom faces are polished at ₹2 per

100\,\text{cm}^2

, while the four side faces are polished at ₹1.50 per

100\,\text{cm}^2

. Find the total cost of polishing the entire outer surface of the box.