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Q.

In a school, exactly at the middle of the stage of the assembly hall, after drawing a circle of 2.8m radius, a beautiful picture is to be drawn in it. Cost for drawing is Rs.300 per 1sq. m. What is the total cost (in Rs) of drawing a picture in this circle?

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a

Rs . 7390

b

Rs . 7392

c

Rs . 6392

d

Rs . 6390

answer is B.

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Detailed Solution

Area of circle = π r^{2}

= \frac{22}{7} \times {(2.8)}^{2}

= 24.64 sq . m

Cost for drawing = Area \times Rs . 300

= 24.64 \times 300

= Rs . 7392

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In a school, exactly at the middle of the stage of the assembly hall, after drawing a circle of 2.8m radius, a beautiful picture is to be drawn in it. Cost for drawing is Rs.300 per 1sq. m. What is the total cost (in Rs) of drawing a picture in this circle?