the length breadth and height of a rectangular box are 30 cm 25 cm and 18cm respectively find the cost of painting its outer surface at 25 paise per centimetre
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l = 30 cm
b = 25 cm
h = 18 cm
Rate = 25 Paise per cm
To find cost of painting the entire box = TSA * 25
TSA of cuboid = 2(lb + bh + hl) = 2*(30*25 + 25*18 + 18*30) cm²
= 2*(750 + 450 + 540) = 2 * 1740 = 3480 cm²
Therefore cost = 3480 *25
= 87,000 paise
⇒ Cost of painting the box = Rs 870
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