Determine when, to the nearest year, $3,000 invested at 5% per year, compounded daily, will be worth $10,000.
Question
Determine when, to the nearest year, 10,000.
Solution
To solve this problem, we will use the formula for compound interest, which is:
A = P (1 + r/n)^(nt)
Where: A = the amount of money accumulated after n years, including interest. P = the principal amount (the initial amount of money) r = annual interest rate (in decimal) n = number of times that interest is compounded per year t = the time the money is invested for in years
We know that A = 3,000, r = 5% or 0.05 (in decimal), and n = 365 (compounded daily). We want to find t.
So, we can set up the equation as follows:
3,000 * (1 + 0.05/365)^(365*t)
First, divide both sides by $3,000:
10,000/3,000 = (1 + 0.05/365)^(365*t)
3.3333 = (1 + 0.05/365)^(365*t)
Next, take the natural logarithm (ln) of both sides:
ln(3.3333) = 365*t * ln(1 + 0.05/365)
Then, divide both sides by 365 * ln(1 + 0.05/365) to solve for t:
t = ln(3.3333) / (365 * ln(1 + 0.05/365))
When you calculate the right side, you get approximately 22.57 years.
So, to the nearest year, 10,000 in 23 years.
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