A 25-pound carton of peaches holds 60 medium peaches or 70 small peaches. In August 2002, the wholesale price for local peaches in Los Angeles was $9.00 per carton for medium peaches and $10.00 per carton for small peaches. (Source: Today's Market Prices.) A fruit vendor sells the medium peaches for $0.50 each and the small peaches for $0.45 each. He estimates that weekly demand for peaches is at least 420 peaches but no more than 630 peaches. He wants to buy enough peaches to meet the minimum estimated demand, but no more than the maximum estimated demand. How many boxes of each size of peaches should he buy if he wants to minimize his wholesale cost? Formulate a linear program for the fruit vendor that will minimize his wholesale cost