A circular track has a radius of 13 meters and is surrounded by a 2-meter wide walkway. What is the total cost to level the walkway if the rate is 25 paise per square meter?

Explanation

The area of the walkway is the difference between the area of the larger circle (radius 15 m) and the smaller circle (radius 13 m). Calculating: π(15² - 13²) = π(225 - 169) = π × 56 ≈ 176 m². At 25 paise (0.25 Rs) per m², the cost is 176 × 0.25 = Rs. 44.