A rectangular tank is 25 m long, 1 200 cm wide and 6 000 mm deep. The tank is open at the top. The
cost of plastering the inside of its walls and bottom (floor) at R26 per square metre is
[1] R19 344,00.
[2] R46 800,00.
[3] R7 800,00.
[4] R13 572,00.
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Answer:
width = 1200×10 = 12000mm
length = 25×1000 = 25000mm
height = 6000mm
area of inner walls and floor = 2(lb+bh+lh)-lb
= 2(bh+lh)+lb
= 2(12000×6000+25000×6000)+25000×12000
= 2(72000000+150000000)+300000000
= 2(222000000)+300000000
= 444000000+300000000
= 744000000mm
= 74400000cm
= 744000m
cost = 26×744000
= ₹19244000
option(a)
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