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Items remaining in a warehouse are modeled by I(d) = 200 − 12d. On what day will 80 items remain?

Answer and explanation

Correct answer: d = 10

The governing concept is a linear decay model. In I(d) = 200 − 12d, the initial amount is 200 when d = 0, and the constant slope −12 means that 12 items disappear each day. To find the day on which 80 items remain, set the model equal to 80: 200 − 12d = 80. Subtracting 200 gives −12d = −120, and dividing by −12 gives d = 10. Substitution confirms the result: I(10) = 200 − 12(10) = 80. Therefore option C is correct. For comparison, d = 8 gives 104 items, d = 9 gives 92 items, and d = 12 gives 56 items, so none of those alternatives reaches the target.

Related tags

Linear DecayLinear ModelWord ProblemClass9Linear Growth And DecayIntroduction To PolynomialsMathematicsClass 9 Mcq

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