Question

9.
A closed metallic cylinder has its base diameter 56 cm and it is 2.25 m high. Find
the cost of the metal used to make it if it costs 80 per square metre.
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Answer 1

Answer:

Rs.74.624

Explanation:

• radius=56÷2=0.28,
• height=2.25,
• Cost of per square matre=80,
• Total surface area of cylinder=2πr(r+h), 2×22÷7×0.28(0.28+2.25),
• (0.9328)metre Square,
• 0.9328 ×80=Rs.74.624