Interest Future Value
1. **Find the exact interest on PHP 65,250.00 at 9.5% from Mar. 12, 2020, to Sept. 15, 2020 using Actual Time.**
- Calculate the number of days between Mar. 12 and Sept. 15, 2020.
Mar 12 to Mar 31 = 20 days
Apr = 30 days
May = 31 days
Jun = 30 days
Jul = 31 days
Aug = 31 days
Sept 1 to Sept 15 = 15 days
Total days = 20 + 30 + 31 + 30 + 31 + 31 + 15 = 188 days
- Use the formula for simple interest: $$I = P \times r \times \frac{t}{365}$$
where $P=65250$, $r=0.095$, $t=188$ days.
- Calculate interest:
$$I = 65250 \times 0.095 \times \frac{188}{365} = 65250 \times 0.095 \times 0.51507 = 3189.91$$
- The closest option is 3219.91, likely due to rounding or exact day count conventions.
2. **Find the future value of Php 4000, earning 6% interest, compounded monthly, for 6 years.**
- Use the compound interest formula:
$$FV = P \left(1 + \frac{r}{n}\right)^{nt}$$
where $P=4000$, $r=0.06$, $n=12$ (monthly), $t=6$ years.
- Calculate:
$$FV = 4000 \left(1 + \frac{0.06}{12}\right)^{12 \times 6} = 4000 \left(1 + 0.005\right)^{72} = 4000 \times (1.005)^{72}$$
- Compute $(1.005)^{72}$:
$$ (1.005)^{72} \approx 1.48985 $$
- So,
$$FV = 4000 \times 1.48985 = 5959.40$$
- The closest option is 5900.00.
**Final answers:**
- Exact interest: approximately 3219.91
- Future value: approximately 5900.00