an open cylindrical tank has a diameter of 3.5m, and height of 7 meters. How much will it cost to paint the curved surface and the base of the tank, if the rate of painting is ₹5.00 per m^2
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Solution:-
Given: diameter= 3.5m
radius (r) = 3.5/2m
height(h) = 7m
Curved Surface Area of Cylinder
= 2πrh
= 2× 22/7× 3.5/2× 7 m^2
= 77 m^2
Area of base of tank
= πr^2
= 22/7× 3.5/2× 3.5/2
= 9.625 m^2
So,
Total area to be painted
= 77+9.625 m^2
= 86.625. m^2
Now, Rate of painting = ₹5per m^2
Therefore, Total cost of painting = ₹(5×86.625)
= ₹ 433.125
Hence, the total cost of painting is ₹433.125
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