A circular path of 13 m radius has marginal walk 2 m wide all round it. Find the cost of leveling the walk at 25p per m2?
Correct answer: C. Rs.44
- A. Rs.45
- B. Rs.78
- C. Rs.44
- D. Rs.40
Explanation
The walk is an annulus with outer radius 15 m and inner radius 13 m, so its area is π[(15 m)² - (13 m)²] = 56π m² = 176 m². At 25 paisa per square metre, the cost is 176 m² × 0.25 rupee per m² = 44 rupees. The likely wrong choice is 78 rupees, which does not correctly subtract the inner circular area.
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