In a village, the cases of a particular infectious disease have been exponentially decreasing at a rate of 80% per year since th
e people started receiving the vaccine. If there were 200 cases in the village to start with, predict the number of cases after 2 years.
1 answer:
Answer:
8
Step-by-step explanation:
Exponential decay is expressed by an equation of the form:
A = P(1 - r)^t
where P = initial value, r = annual rate of decay, t = time in years
A = 200(1 - 0.80)^2
A = 8
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