Attempting to analyze the relationship between advertising and sales, the owner of a furniture store recorded the monthly advertising budget ($) and sales ($1,000) for 8 months as follows Advert 23 46 60 28 33 25 31 36 Sales 9.6 11.3 12.8 8.9 12.5 12.0 11.4 12.6 How much should the store spend on adverting if a sales value of $50,000 is desired