Future Value Time C4A328
1. **State the problem:** We want to find how many years it takes for an investment to grow to a future value of 2300 with an interest rate of 5% and an interest earned of 300.
2. **Identify given values:**
- Future value, $A = 2300$
- Interest rate, $r = 0.05$
- Interest earned = $300$
3. **Find the principal $P$:** Since interest earned is $300$, and $A = P + \text{interest}$, we have
$$P = A - 300 = 2300 - 300 = 2000$$
4. **Use the compound interest formula:**
$$A = P(1 + r)^n$$
where $n$ is the number of years.
5. **Plug in known values:**
$$2300 = 2000(1 + 0.05)^n$$
6. **Simplify:**
$$\frac{2300}{2000} = 1.05^n$$
$$1.15 = 1.05^n$$
7. **Solve for $n$ using logarithms:**
$$n = \frac{\log(1.15)}{\log(1.05)}$$
8. **Calculate:**
$$n \approx \frac{0.0607}{0.0212} \approx 2.86$$
9. **Interpretation:** It takes approximately 2.86 years to reach a future value of 2300 with a 5% interest rate and 300 interest earned.