1. **State the problem:** Halima took out a loan with compound interest. We know the amount owed at the end of 2002 (£427.33) and at the end of 2007 (£592.39). We need to find how much interest the loan gathered over the next 3 years after 2007.
2. **Identify the formula:** The compound interest formula is:
$$ A = P(1 + r)^t $$
where $A$ is the amount after time $t$, $P$ is the principal amount, $r$ is the annual interest rate, and $t$ is the number of years.
3. **Find the interest rate $r$:**
We know:
$$ 592.39 = 427.33(1 + r)^5 $$
Divide both sides by 427.33:
$$ \frac{592.39}{427.33} = (1 + r)^5 $$
$$ \approx 1.3869 = (1 + r)^5 $$
Take the 5th root:
$$ 1 + r = \sqrt[5]{1.3869} $$
$$ 1 + r \approx 1.0683 $$
So,
$$ r \approx 0.0683 $$ or 6.83% per year.
4. **Calculate amount after 3 more years (from 2007 to 2010):**
$$ A = 592.39(1 + 0.0683)^3 $$
$$ A = 592.39 \times 1.0683^3 $$
Calculate $1.0683^3$:
$$ 1.0683^3 \approx 1.219 $$
So,
$$ A \approx 592.39 \times 1.219 = 721.88 $$
5. **Calculate interest gathered over these 3 years:**
$$ \text{Interest} = 721.88 - 592.39 = 129.49 $$
**Final answer:** The loan gathered approximately £129.49 in interest over the next 3 years after 2007.
Compound Interest 59391C
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