Question
A cuboidal water tank has dimensions (20 × 14 × 12) cm
and is open from the top. If painting the outer surface costs Rs. 5 per cm², find the total painting cost.Solution
ATQ, Area to be painted = lateral surface area + area of base = 2 × (length + breadth) × height + length × breadth = 2 × (20 + 14) × 12 + 20 × 14 = 2 × 34 × 12 + 280 = 816 + 280 = 1,096 cm² Required cost = 1,096 × 5 = Rs. 5,480
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