Question: Elizabeth Barton borrowed $69806980$ for landscaping. She signed a $90$-day note on May $10$ at $9 \frac{1}{4}\%$ interest. Find the due date and the maturity value.
1. **State the problem:**
Elizabeth Barton borrowed $69806980$ for landscaping and signed a $90$-day note on May $10$ with an interest rate of $9 \frac{1}{4}\%$ (which is $9.25\%$). We need to find the due date and the maturity value.
2. **Find the due date:**
The note is for $90$ days starting from May $10$.
- May has $31$ days. From May $10$ to May $31$ is $31 - 10 = 21$ days.
- Remaining days: $90 - 21 = 69$ days.
- June has $30$ days. After June, remaining days: $69 - 30 = 39$ days.
- July has $31$ days. After July, remaining days: $39 - 31 = 8$ days.
- August has $31$ days. Adding $8$ days into August means the due date is August $8$.
**Due date:** August $8$.
3. **Calculate the maturity value:**
The maturity value is the principal plus interest.
- Principal $P = 69806980$
- Rate $r = 9.25\% = 0.0925$
- Time $t = \frac{90}{360} = 0.25$ years (using the banker's rule of 360 days per year)
Interest formula:
$$ I = P \times r \times t = 69806980 \times 0.0925 \times 0.25 $$
Calculate interest:
$$ I = 69806980 \times 0.0925 \times 0.25 = 69806980 \times 0.023125 $$
Calculate:
$$ I = 1614061.525 $$
4. **Calculate maturity value:**
$$ \text{Maturity value} = P + I = 69806980 + 1614061.525 = 71421041.53 $$
Rounded to the nearest cent, the maturity value is $71421041.53$.
**Final answers:**
- Due date: August 8
- Maturity value: 71421041.53