a cylindrical vessel without lid has to be tin coated including both of its sides if the radius of its base is 1/2 m and its height is 1.4m calculate the coast of tin coating at the rate of rs 50 per 1000cm2
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Answer:
We have,
r=70cm, h=1.4m=140cm
∴ Area to be tin coated=2(2πrh+πr
2
)=2πr(2h+r)
=2×
7
22
×70(280+70)=154000cm
2
.
Cost of tin coating Rs. 3.50=1000cm
2
Total cost=3.50×
1000
154000
=539
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