Barbara and Michael just ordered their dream granite countertop from Ayayai's Inc., which had to purchase the slab, cut it, treat it, and install it. Throughout the process, Barbara and Michael worked with a Ayayai's salesperson to make sure they chose the right kitchen layout, edging, and other finishes. Here are the costs that Ayayai's incurred last month to complete 10 kitchen projects like Barbara and Michael's. Cost of the stone slabs $24,400 Overhead costs in fabrication process 3,300 Commission for salespeople 3,150 Depreciation on sales and office space 3,000 Marketing costs 700 Research and development costs 1,300 Wages for cutting, treating, and installation labor 20,300How much of the above cost reflects total SG?