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Question

The cost of  painting a conical tent of radius 3.5 m and slant height 7 m at a rate of  10/m2 is .


Correct Answer
A
 770
Your Answer
B
 335
Your Answer
C
 1,005
Your Answer
D
 370

Solution

The correct option is A  770
Given that, 
radius of cone is 3.5 m.
Slant height of cone is 7 m.
Rate of painting is  10/m2.

We know that,
curved surface area of a cone =πrl

Now, cost of painting the tent
=Rate of painting×Curved surface area of tent
=10×227×3510×7
= 770

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