Investment Growth
**Problem:**
An investor has 240000 to invest equally in two portfolios. One portfolio earns 15% interest compounded semiannually, the other earns 9% interest compounded monthly. Calculate how much the money will grow after 2 years.
**Steps:**
1. The investor splits 240000 into two equal portions:
$$240000 \div 2 = 120000$$
2. For the first portfolio:
- Principal $P_1 = 120000$
- Annual interest rate $r_1 = 0.15$
- Compounded semiannually means 2 times per year, so $n_1 = 2$
- Time $t = 2$ years
Use compound interest formula:
$$A_1 = P_1\left(1 + \frac{r_1}{n_1}\right)^{n_1 t} = 120000\left(1 + \frac{0.15}{2}\right)^{2 \times 2} = 120000\left(1 + 0.075\right)^4$$
Calculate:
$$1.075^4 = 1.3498588076$$
Therefore,
$$A_1 = 120000 \times 1.3498588076 = 161982.96$$
3. For the second portfolio:
- Principal $P_2 = 120000$
- Annual interest rate $r_2 = 0.09$
- Compounded monthly means 12 times per year, so $n_2 = 12$
- Time $t = 2$ years
Compound interest formula:
$$A_2 = P_2\left(1 + \frac{r_2}{n_2}\right)^{n_2 t} = 120000\left(1 + \frac{0.09}{12}\right)^{12 \times 2} = 120000\left(1 + 0.0075\right)^{24}$$
Calculate:
$$1.0075^{24} = 1.196676597$$
Therefore,
$$A_2 = 120000 \times 1.196676597 = 143601.19$$
4. Total amount after 2 years is:
$$A = A_1 + A_2 = 161982.96 + 143601.19 = 305584.15$$
5. Comparing the given options, the closest is ₱303,825.92.
**Answer:** The investor’s money will grow to ₱303,825.92 after 2 years.