Q4 of 14 Page 303

Find the cost of painting a cuboid of dimensions 20cm × 15 cm × 12 cm at the rate of 5 paisa per square centimeter.

Measurement of the cuboid

Length(L) = 20 cm breadth(B) = 15 cm and height(H) = 12cm


Total surface area = 2(LB + BH + LH)


= 2(20 × 15 + 15 × 12 + 20 × 12)


= 2(300 + 180 + 240)


= 2(720)


= 1440 cm2


Rate of painting 1cm2 = ₹0.05


Rate of painting a whole cuboid = 0.05 × 1440


= ₹72


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