Free SAT Practice Question

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ID: DSAT-MATH-PSDA-022
Section: Digital SAT Math - Problem Solving & Data Analysis (PS&DA)
Topics: Ratios, rates, proportional relationships, and units; MCQ
Difficulty level: Hard

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A model estimates that at the end of each year from 2017 to 2023, the number of rats in a population was 60% less than the number of rats in the population at the end of the previous year. The model estimates that at the end of 2018, there were 7,000 rats in the population. Which of the following equations represents this model, where \(n\) is the estimated number of rats in the population \(t\) years after the end of 2017 and \(t \leq 6\) ?
A\(n = 17,500(0.6)^{t}\)
B\(n = 17,500(0.4)^{t}\)
C\(n = 1,400(0.6)^{t}\)
D\(n = 7,000(0.4)^{t}\)
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