The following regression model has been proposed to predict sales at a fast food outlet. i=18-2x1+7x2+15x3 where x 1 = the number of competitors within 1 mile x 2 = the population within 1 mile (in 1,0005) x 3 = 1 if drive-up windows are present, 0 otherwise if = sales (in $1,0005) 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). 0 a. 97,000 0 b.167,000 O c. 99.000 0 d. 197,000