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The height of a conical tank is 60 cm and the diameter of its base is 64cm. The cost of painting it from outside at the rate of ₹ 35 per sq. m. is :
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- ₹ 52.00 approx.
- ₹ 39.20 approx.
- ₹ 35.20 approx.
- ₹ 23.94 approx.
Correct Option: D
Area of the curved surface = πrl
where,lrh = √r² + h² = √(32)² + (60)²
= √4624 = 68 cm
| Area of the curved surface = πrl = | × 32 × 68 | |
| 7 |
| ∴ Total cost of painting = | × 32 × 68 | = ₹ 23.94 approx. | ||
| 7 | 10000 |
