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Question:

Find the cost of digging a cuboidal pit 8m long, 6m broad and 3m deep at the rate of 30 per m³.

Solution:

l=8m, b=6m, h=3m
Volume = l × b × h = (8 × 6 × 3)m³ = 144m³
Cost of digging per m³ volume = Rs. 30
Cost of digging per 144m³ volume = Rs. 144 × 30 = Rs. 4320