The following regression model has been proposed to predict sales at a fast food outlet. 9-18-2x 1+7x2+15x 3 where x1 the number of competitors within 1 mile x2=the population within 1 mile (in 1,000s) x3-1 if drive-up windows are present, 0 otherwise -sales (in $1,000s) Predict sales for a store with 3 competitors, a population of 20,000 within one mile, and 3 drive-up windows (give the answer in dollars). O a. 97,000 Ob. 167,000 O c. 99,000 O d. 197,000