The cost of decorating the curved surface area of a cone is Rs. 6,270. If its base diameter is 42 cm and slant height is 19 cm, then what is the per cm2 cost (in Rs.) of decoration? (Use = 22/7)
Given:
Cost of decoration = ₹6270
Diameter = 42 cm
Radius (r) = 21 cm
Slant height (l) = 19 cm
Formula Used:
Curved Surface Area of cone = π × r × l
Cost per cm² = Total cost ÷ Curved Surface Area
Solution:
CSA =× 21 × 19 = 22 × 3 × 19 = 1254 cm²
Cost per cm² = 6270 ÷ 1254 = ₹5
The cost per cm² of decoration is ₹5.
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