1. **State the problem:** Joe wants to save $5500 to buy a gaming PC and chair. He currently has $5225 saved and invests it at an annual interest rate of 1.75%. We need to find how long it will take for his savings to grow to $5500.
2. **Formula used:** For compound interest (assuming interest is compounded annually), the formula is:
$$A = P(1 + r)^t$$
where:
- $A$ is the amount of money accumulated after $t$ years, including interest.
- $P$ is the principal amount (initial money).
- $r$ is the annual interest rate (decimal).
- $t$ is the time in years.
3. **Set up the equation:**
We want $A = 5500$, $P = 5225$, and $r = 0.0175$.
$$5500 = 5225(1 + 0.0175)^t$$
4. **Isolate the exponential term:**
$$\frac{5500}{5225} = (1.0175)^t$$
5. **Simplify the fraction:**
$$\frac{5500}{5225} = \frac{\cancel{5500}}{\cancel{5225}} = 1.0526$$ (approximate)
6. **Take the natural logarithm of both sides:**
$$\ln(1.0526) = \ln((1.0175)^t)$$
7. **Use logarithm power rule:**
$$\ln(1.0526) = t \ln(1.0175)$$
8. **Solve for $t$:**
$$t = \frac{\ln(1.0526)}{\ln(1.0175)}$$
9. **Calculate the values:**
$$\ln(1.0526) \approx 0.0513$$
$$\ln(1.0175) \approx 0.0173$$
10. **Final calculation:**
$$t = \frac{0.0513}{0.0173} \approx 2.97$$ years
**Answer:** It will take Joe approximately 2.97 years to have enough money to make his purchase and stop getting cooked online.
Savings Time D96B57
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