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The following regression model has been proposed to predict sales at a fast food outlet. y = 18 - 2x 1 + 7x 2 +15x 3 where x 1 = the number of competitors within 1 mile x 2 = the population within 1 mile (in 1,000s) x 3 = 1 if drive-up windows are present, 0 otherwise y = 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 O b. 167,000 O c. 99,000 O d. 197,000