1. **Problem:** Mr. Salinas saves 3000 per month, interest rate 9% compounded monthly, for 6 months. Find the future value.
2. **Solution:** Use the future value of an ordinary annuity formula:
$$ FV = P \times \frac{(1 + r)^n - 1}{r} $$
where $P=3000$, monthly rate $r=\frac{9\%}{12}=0.0075$, and $n=6$.
Calculate:
$$ FV = 3000 \times \frac{(1 + 0.0075)^6 - 1}{0.0075} $$
$$ = 3000 \times \frac{1.046134 - 1}{0.0075} = 3000 \times 6.1512 = 18453.57 $$
2. **Problem:** Althea pays 38973.76 each year for 3 years at 8% compounded quarterly. Find the principal borrowed.
3. **Solution:** Given annuity payment $A = 38973.76$, rate per quarter $r=\frac{8\%}{4}=0.02$, number of quarters $n=3 \times 4=12$. Use present value formula for annuity:
$$ PV = A \times \frac{1 - (1 + r)^{-n}}{r} $$
Calculate:
$$ PV = 38973.76 \times \frac{1 - (1 + 0.02)^{-12}}{0.02} $$
$$ = 38973.76 \times 10.5754 = 412115.90 $$
3. **Problem:** How long is the deferral period if you pay 2000 monthly for 5 years starting after 7 months?
4. **Solution:** Payment period $n = 5 \times 12 = 60$ months, but payments start after 7 months, so deferral period is 7 months.
4. **Problem:** Ms. Poliquit pays 5000 quarterly for 8 years starting 2 years later. Find deferral period.
5. **Solution:** Deferral period is 2 years = $2 \times 4 = 8$ quarters.
5. **Problem:** Find the semi-annual coupon of a bond with face value 30000, 10% annual coupon, semiannual payments.
6. **Solution:** Annual coupon = 10% of 30000 = 3000
Semi-annual coupon = $\frac{3000}{2} = 1500$
6. **Problem:** Dividend declared 50000000 total, 100000 shares. Find dividend per share.
7. **Solution:** Dividend per share = $\frac{50000000}{100000} = 500$
7. **Problem:** With 1000 shares, 10% dividend on par value 450. Find total dividend.
8. **Solution:** Dividend per share = $10\% \times 450 = 45$
Total dividend = $45 \times 1000 = 45000$
8. **Problem:** Find dividend per share in problem 7.
9. **Solution:** Dividend per share = 45
Final Answers:
1. $18453.57$
2. $412115.90$
3. 7 months
4. 8 quarters
5. $1500$
6. $500$
7. $45000$
8. $45$
Compound Interest Annuities
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