24. A cylindrical vessel, without lid, has to be tin-coated including both of its sides. If the radius of its
base is 12 m and its height is 1.4 m, calculate the cost of tin-coating at the rate of Rs. 50 per cm
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Answer:
Rs.5181
Radius of the base (r)=
2
1
m=
2
1
×100cm=50cm
Height (h)=1.4m=1.4×100cm=140cm
Surface area to be tin-coated=2(2πrh+πr
2
)
=2(2×3.14×50×140+3.14×(50
2
=2(43960+7850)=2(51810)=103620cm
2
∴ Cost of tin-coating at the rate of Rs.50 per 1000cm
2
=Rs.
1000
50
×103620= Rs.5181
Step-by-step explanation:
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