7. Calculate the cost (Rs.) of 100 mm thick brick
lining of a septic tank of size 5 mx 3 mx 1.5 m, if
the rate of lining is Rs. 200 per square meter.
(a) 4500
(b) 4800
(c) 5400
(d) 7800
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Answer:
ans = 7800
Step-by-step explanation:
total surface area to be lined -
A=2 (lh+bh)
A=2 ( 5×3 + 1.5×3)
A=2 (15 +4.5)
A=2 × 19.5
A= 39m^2
total cost of lining -
total cost =area × cost
total cost = 39 ×200
total cost = 7800rs.
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