39.
The bottom of a right cylindrical shaped vessel made
in closed by a cone shaped vessel as shown in the figure. The radios
the circular base of the cylinder and radius of the circular base of the cone
are cach is equal to 7 cm. If the height of the cylinder is 20 cm and hech
of cone is 3 cm, calculate the cost of milk to fill completely this vessel
the rate of Rs. 20 per litre.
20 cm
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Answer:
Rs 58.52
Step-by-step explanation:
Volume of cylinder = π R²h
R = 7cm
h = 20 cm
= (22/7)(7²)(20)
= 154 * 20
= 3080 cm³
Bottom is closed by cone so cone would be inside
Volume of cone = (1/3)π R²h
R = 7 cm
h = 3 cm
=(1/3)(22/7)(7²)(3)
= 154 cm³
Volume of vessel = 3080 - 154 = 2926 cm³
1 litre = 1000 cm³
2926 cm³ = 2.926 Litr
Cost of Milk = Rs 20 per litre
Cost of milk = 20 * 2.926 = Rs 58.52
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