Annuity Future Value
1. **State the problem:** We need to find the future value of an ordinary annuity with the following details:
- Periodic payment: 1400
- Payment interval: 3 months
- Term: 14 years
- Interest rate: 5% annually
- Conversion period: monthly
2. **Convert all terms to consistent units:**
- Since payments are every 3 months, there are 4 payments per year.
- Total number of payments $n = 14 \times 4 = 56$.
- The nominal annual interest rate is 5%, compounded monthly, so the monthly interest rate is $\frac{5}{100} \div 12 = 0.004167$.
- The interest rate per payment period (3 months) is $i = 0.004167 \times 3 = 0.0125$.
3. **Use the future value of an ordinary annuity formula:**
$$
FV = P \times \frac{(1+i)^n - 1}{i}
$$
where
- $P = 1400$ (payment per period),
- $i = 0.0125$ (interest rate per period),
- $n = 56$ (number of payments).
4. **Calculate:**
$$
(1+i)^n = (1.0125)^{56} \approx 2.000978
$$
$$
FV = 1400 \times \frac{2.000978 - 1}{0.0125} = 1400 \times \frac{1.000978}{0.0125} = 1400 \times 80.07824 = 112109.54
$$
5. **Final answer:** The future value of the annuity is approximately **112109.54**.