2 50 points A retailer, in business for over 50 years, has developed the following regression model from the past 60 months of operating data: Monthly sales dollars = $50,000+ $4.70A + $30B - $1,000X Where: 01:30:48 A = number of customers B = advertising dollars per month X = 1 if a winter month X = 0 if other months An appropriate interpretation of this model is that: