a fixed open cylindrical metal tank having radius 4.9m and height 7.5m is to be painted from inside and outside. what will it cost at the rate of rs.10 per metre sq.
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Answer: a fixed cylindrical metal tank having radius 4.9cm and height 7.5 m is to be painted from inside and outside
cost at the rate of 10rs per m2 = Rs 46.5
Step-by-step explanation:
Inside surface area = 2πrh + 2πr²
= 2πr( h + r)
= 2 * (22/7)(4.9) (4.9 + 750) ( 7.5 m = 750 cm)
= (30.8)*(754.9)
= 23250.92 cm²
= 2.325 m² ( 1cm² = 1/10000 m²)
outside surface area = 2πrh + 2πr² = 381.92 cm² ( neglecting thickness of cylinder)
total Surface area = 2 * 2.325 = 4.65 cm²
Cost = Rs 10 /m²
Total cost = 10 * 4.65 = Rs 46.5
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