SOLUTION: a cylindrical vessel, without lid, has to be tin-coated on its both sides. if the radius of the base is 70cm and its height is 1.4m, calculate the cost of tin coating at the rate o

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assuming no thickness to the sides of the can, i would estimate the answer to be as follows:
h = 1.4*m = height of the can
r = 70*cm = 7000*m = radius of the can (1 centimeter = 100 meters)
surface area on both sides of the can would be 2 * circumference of the base * the height.
c = circumference of the base = circumference of a circle = 2*pi*r.
s = surface area on both sides of the can.
s = 2*c*h = 2*2*pi*r*h = 2*pi*7000*m*1.4*m = 2*pi*9800*m^2 = pi*19600*m^2 = 61575.21601*m^2
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not sure what Rs3.50 per 1000m2 means but i think it means:
cost of tin coating = $3.50 per 1000 square meters of surface area.
ctc = cost of tin coating.
ctc = 61575.21601*m^2 * $3.5 / (1000*m^2) = $215.513256 = $215.51
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