Question
An open-top metal box measures 20 cm in length, 10 cm in
width, and 12 cm in height. If the cost to paint each cm² from the outside is Rs. 6.5, how much will the total painting cost be?Solution
ATQ,
Area to be painted = side surface area + bottom area = 2 × (length + width) × height + length × width = 2 × (20 + 10) × 12 + 20 × 10 = 2 × 30 × 12 + 200 = 720 + 200 = 920 cm² Required cost = 920 × 6.5 = Rs. 5,980
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