Answer :

We have,


Radius of base= 20 cm = 0.2 m


Height of cone = 1 m


slant height l = = m = m


= 1.02 m


Curved surface area of a cone = πrl =3.14×0.2×1.02 m2


Cost of painting = Rs. [(3.14×0.2×1.02×12)×50] = Rs. 384.33


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