The percentage y (of total personal consumption) an individual spends on food is approximately y = 35x−0.25 percentage points  (6.5 ≤ x ≤ 17.5) where x is the percentage the individual spends on education.† An individual finds that she is spending x = 7 + 0.2t percent of her personal consumption on education, where t is time in months since January 1. Use direct substitution to express the percentage y as a function of time t (do not simplify the expression). (NOTE: January 1 is represented by t = 0.) y(t) =       Use the chain rule to estimate how fast the percentage she spends on food is changing on September 1. (Round your answer to two decimal places.)

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