What will be cost of painting tank at the cost of ₹15 per 100 m2leaving upper part and lower base ?(i) ₹ 27,000 (ii) ₹ 25,000(iii) ₹ 24,000 (iv) ₹ 20,000
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What will be cost of painting tank at the cost of ₹15 per 100 m2leaving upper part and lower base ?(i) ₹ 27,000
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Answer:
Hence, volume of the cylinder =πr2h=(π×3×3×18)dm3=(722×9×18)dm3
Step-by-step explanation:
Let r dm be the radius of the base and h dm be the height of the cylindrical tank.
Then, h=6r (given)
Total surfacea area =2πr(r+h)=2πr(r+6r)=14πr2
cost of painting =Rs.(14πr2)×10060=Rs542r2
It is given that the cost of painting is Rs. 237.60
∴542πr2=237.60⇒542×722×r2=237.60
⇒r2=237.60×425×227=9⇒r=3dm
∴h=6r=18dm
Hence, volume of the cylinder =πr2h=(π×3×3×18)dm3=(722×9×18)dm3
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