Chris Sandvig Irrigation, Inc has summarized the price list from four potential suppliers of an underground control valve. See the table below Annual usage is 700 valves order cost is $14 per order and annual inventory holding costs are $2.15 per unit. Which vendor should be selected and what order quantity is best if Sandvig Irrigation wants to minimize total cost? Chris Sandvig Irrigation should order units at a time from (enter your response as a whole number). I've seen answers to this question - but I don't understand how the sample quantity was chosen.