A room is 7 5 m long 5 5 m broad and 5 m high What will be the expenditure in covering the walls by ...........

Quantitative Aptitude ( CCS) Mensuration 3D

A room is 7.5 m long, 5.5 m broad and 5 m high. What will be the expenditure in covering the walls by paper 40 cm broad at the rate of 80 paise per metre ?

255.5

260

282.25

244

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Explanation:

Area of four walls = 2 × 5 (7.5 + 5.5) = 130 m^2
Area of required paper = 130 m^2
Breadth of the paper = 40 cm = 0.4 m
∴ Length of the paper =130/0.4= 325 m
∴ Cost of paper at 80 paise per meter = 325 × 0.80 = Rs.260