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lara [203]
3 years ago
9

Cate purchases $1600 worth of stock and her broker estimates it will increase in value by 4.2% each year. After about how many y

ears will the value of Cate’s stock be about $2000?
Mathematics
1 answer:
Reil [10]3 years ago
4 0
For this case we have a function of the form:
 y = A * (b) ^ x

 Where,
 A: initial amount
 b: growth rate
 x: time in years
 Substituting values we have:
 y = 1600 * (1,042) ^ x

 For the moment when the value of Cate's stock is $ 2000 we have:
 2000 = 1600 * (1,042) ^ x

 From here, we clear x:
 (1,042) ^ x = 2000/1600

log1.042 ((1.042) ^ x) = log1.042 (2000/1600)
 x = log1.042 (2000/1600)

x = 5.4 years
 Answer:
 
the value of Cate's stock will be about $ 2000 in:
 
x = 5.4 years
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