Pong example buy shoes to sell Phong as both buyers and sales. If a pair of shoes for sale buy Pong each 300 baht Pong as a buyer. Call price boots that cost or purchase that Pong cost. If this pair of shoes sold, Pong students 450 baht Pong as a seller called the boots sale price, sale price, and the Pong that students have as a buyer. When the sales price is greater than the cost. Call for sale price with the cost of that profit.
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