There are the following proposals in which you can find the type of each element of the trusses. For proposal 2, there should be some excavation. Discard the excavation cost and advise the team on the cost-effective proposal by considering both the proposals and the assumptions below. Material Cost: Carbon steel bars - $4.50 per kilogram Carbon steel tubes - $6.30 per kilogram High-strength steel bars - $5.00 per kilogram High-strength steel tubes - $7.00 per kilogram Quenched and tempered steel bars - $5.55 per kilogram Quenched and tempered steel tubes - $7.75 per kilogram Steel Production (fabrication) Cost: $1000.00 per each steel cross-section type. Connection Cost: $500.00 per joint. Use the Bill of Quantity table (appendix I) for the estimation. You may need to add a row/s. Then, upload the appendix.