solve the following
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r this question of class 9
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Length=5m
breadth=4m
height=3m
CSA + area of ceiling
2(l+b)h + l×b
2(5+4)3+ 5×4
2×9×3+20
54+20=74m^2.
cost = area ×rate
cost = 74×7.50= 555
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