A cylindrical vessel open at the top has diameter 28 cm and height 10 cm. The cost of tin-plating it on inside at the rate of ₹50 per 100 cm², is: (Usе, $π=\frac{22}{7}$)

₹748

We have,

A cylindrical vessel open at the top has diameter 28 cm and height 10 cm.

Now the radius = 28/2 = 14 cm

Now the total inside surface area of the vessel = 2πrh + πr²

= 2 × \(\frac{22}{7}\) × 14 × 10 + \(\frac{22}{7}\) × (14)²

= 1496cm²

The cost of tin-plating it on inside at the rate of ₹50 per 100 cm² = 1496 × 0.5 = 748Rs.