Management of a fast-food chain proposed the following regression model to predict sales at outlets: y = β0 + β1x1 + β2x2 + β3x3 + ε, where y = sales ($1000s) x1 = number of competitors within one mile x2 = population (in 1000s) within one mile x3 is 1 if a drive-up window is present, 0 otherwise The following estimated regression equation was developed after 20 outlets were surveyed: begin mathsize 14px style y with hat on top end style = 14.8 − 3.5x1 + 3.2x2 + 15.8x3 Use this equation to predict sales for a store with 3 competitors, a population of 5100 within one mile, and no drive-up window. Note: omit the $ symbol in your answer