You are given below the following information about advertising and sales: Adv. Exp.-(X) ($ crore) Sales (y) |($. crore) Mean 20 100 S.D. 12 Correlation coefficient 0.8 (a) Calculate the two regression lines. (b) Find the likely sales when advertisement expenditure is $. 25 crore. (c) What should be advertisement expenditure if the company wants to attain sales target of $ 130 crore?

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