Answer :

Toy is in the form of a cylinder with hemisphere ends


Total length of toy = 90 cm


Diameter of toy = 42 cm


Radius of toy = r = 21 cm


Length of cylinder = l = Total length of toy – 2 × Radius of toy


= 90 – 2 × 21 cm = 48 cm


For cost of painting we need to find out the curved surface area of toy


Curved surface area of cylinder = 2πrl


= 2 × 22/7 × 21 × 48 cm2


= 6336 cm2


Curved surface area of hemispherical ends = 2 × 2πr2


= 2 × 2 × 22/7 × 21 × 21 cm2


= 5544 cm2


Surface area of toy = Curved surface area of cylinder + Curved surface area of hemispherical ends


Surface area of toy = 6336 cm2 + 5544 cm2 = 11880 cm2


Cost of painting = Rs 0.70/cm2


Total Cost of painting = Surface area of toy × Cost of painting


= 11880 cm2 × Rs 0.70/cm2 = Rs 8316.00


Total cost of painting the toy = Rs 8316.00


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