The four walls and ceiling of a room are to be repaired. The length and breadth of the room are $8 m a n d 4 m$ and its height $3 m$ . Find the cost of repair at $R s . 30$ per $m^{2}$ .

R s . 3100

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R s . 3110

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R s . 3120

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R s . 3121

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Solution

The correct option is A $R s . 3120$ .
Total surface area of the cubiodal room $= 2 [(8 \times 4) + (8 \times 3) + (4 \times 3)] = 2 [32 + 24 + 12] = 136$
Area of the of rectangular floor(to be excluded) $= 8 \times 4 = 32 m^{2}$
Area of 4 walls and the ceiling, $= 136 - 32 = 104 m^{2}$
Cost of repair $R s .30$ per $m^{2}, = R s .3120$

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The four walls and ceiling of a room are to be repaired. The length and breadth of the room are 8mand4m and its height 3m. Find the cost of repair at Rs.30 per m2.

The correct option is A Rs.3120.Total surface area of the cubiodal room=2[(8×4)+(8×3)+(4×3)]=2[32+24+12]=136Area of the of rectangular floor(to be excluded)=8×4=32m2Area of 4 walls and the ceiling, =136−32=104m2Cost of repair Rs.30 per m2,=Rs.3120

The four walls and ceiling of a room are to be repaired. The length and breadth of the room are $8 m a n d 4 m$ and its height $3 m$ . Find the cost of repair at $R s . 30$ per $m^{2}$ .