Problem-Solving and Data AnalysisVery hardYearly percent decrease in a decay model
Problem-Solving and Data Analysis practice question
The number of cars of a certain model sold each year is modelled by C(t) = 200(0.8)ᵗ, where t is the number of years after the model's launch. According to the model, by what percent do yearly sales decrease each year?
Answer: 20
Each year sales are multiplied by 0.8, a 20% decrease.
Common wrong answers
- If you answered 80
- 80 is the percent that remains, not the decrease.
- If you answered 200
- 200 is the starting number of sales.
- If you answered 0.8
- 0.8 is the factor, not a percent.
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