Half a gross is 72. The cost of 72 things will depend on what things you are purchasing.
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1 gross = 144 → ½ gross = ½ × 144 = 72
8 is the answer . Since half a kg is 500g, 100 g would cost 1/5 as much. 1/5 of 40 is 8.
Selling price = Cost of goods sold + Gross profit percentage on sales
Cost of each pencil is: 9.75/39. Or, .25 each. A gross is 144 items. So, a gross of pencils would cost 36. Of course, a gross is a unit of quantity where there is often a discount from the single unit price. So a gross of pencils may have a price less than 144 times the single unit price.
Cost = Selling Price - Gross Profit By using this formula or method easily we can get the selling price of the product