I agree with the 3 because the price including product costing, and the cost of transport and profit increases in the cost 7 baht: shipping cost 3 baht profit 5 baht.
I agree with people who think that it is a product price 3 total cost of your shipping expenses and profit increases in proportion to cost 7/3: freight baht: THB 5 profit.
I agree with the 3 of them, because it is the product price at cost as well as the cost of shipping, and have a profit increase in costs 7 Baht: shipping cost 3 Baht: profits 5.