Question

An open container made up of metal sheet is in the form of a frustum of cone of height 8cm with radii of its lower and upper ends are as 4cm and 10cm respectively. Find the cost of oil which can completely fill the container at the rate of Rs 50 per liter. Also find the cost of metal used if it costs Rs 5 per 100cm2

Answer 1

Step-by-step explanation:

Volume of Frustum of cone=

1/3πh(r²+rR+R²)

1/3×22/7×8(4²+4×10+10²)

=1307.42cm²

cost of metal used= 1307.42×5÷100

=Rs 65.371

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