A firm knows from its past experience that its monthly average expenses (X) on advertisement are Rs 25,000 with standard deviation of Rs 25.25. Similarly, its average monthly product sales (Y) have been Rs 45,000 with standard deviation of Rs 50.50. Given this information and also the coefficient of correlation between sales and advertisement expenditure as 0.75, estimate (i) the most appropriate value of sales against an advertisement expenditure of Rs 50,000 (ii) the most appropriate advertisement expenditure for achieving a sales target of Rs 80.000

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