a rectangular box is 10 centimetre long by sentimeter broad and for CM in height how much will it cost to paint the outer surface of the box at the rate of rupees 40 per square centimetre
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Correct Question :- a rectangular box is 10 cm long by 5 cm broad and 4 cm in height . How much will it cost to paint the outer surface of the box at the rate of Rs. 40 per square cm .
Answer :-
→ surface area of cuboid = 2(lb + bh + hl)
putting values we get,
→ surface area = 2(10*5 + 5*4 + 4*10) = 2(50 + 20 + 40) = 2 * 110 = 220 cm².
then,
→ Total rate of paint = Rate per cm² * Total surface area =
40 * 220 = Rs.8800 (Ans.)
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