Question : Find the total cost of painting the outside of a closed cuboidal box, which is 7 m long, 5 m wide and 2 m high, at the rate of 2.4 per m2.
Option 1: INR 296.30
Option 2: INR 263.40
Option 3: INR 283.20
Option 4: INR 251.20
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Correct Answer: INR 283.20
Solution : Length, $l = 7$ m Breadth, $b = 5$ m Height, $h = 2$m Rate of painting = INR 2.4 per m 2 Total surface area $=2(lb+bh+lh)$ $= 2 × (7 × 5 + 5 × 2 + 2 × 7)$ $= 2 × (35 + 10 +14)$ $= 2 × 59$ $= 118$ m 2 Total price = 118 × 2.4 = INR 283.20 Hence, the correct answer is INR 283.20.
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