A model for the food-price index (the price of a representative basket of foods) between 1984 and

A model for the food-price index (the price of a representative €œbasket€ of foods) between 1984 and 1994 is given by the function where t is measured in years since midyear 1984, so 0
(t) Is measured in 1987 dollars and scaled such that l(3) = 100. Estimate the times when food was cheapest and most expensive during the period 1984€“1994.

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I(1) = 0.0000904515 + 0.001438r* – 0.065611 + 0.45981 - 0.6270r + 99.33 %3D