Q:
Which of the following is true for economic spacing?
A) cost of trusses should be equal to twice the cost of purlins
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B) cost of trusses should be equal to twice the cost of purlins minus cost of roof coverings
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C) cost of trusses should be equal to the cost of purlins plus cost of roof coverings
| D) cost of trusses should be equal to twice the cost of purlins plus cost of roof coverings
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Explanation