Monthly Payment
1. **State the problem:** You borrow 5000 and agree to repay in 36 equal monthly payments with a monthly interest rate of 1% (12% annual compounded monthly). Find the monthly payment (pmt).
2. **Given:**
- Present value, $PV = 5000$
- Annual interest rate, $r = 12\% = 0.12$
- Number of years, $n = 3$
- Number of months per year, $m = 12$
- Number of payments, $N = n \times m = 36$
- Monthly interest rate, $i = \frac{r}{m} = \frac{0.12}{12} = 0.01$
3. **The amortization formula (ordinary annuity present value formula) is:**
$$
PV = pmt \times \frac{1 - (1 + i)^{-N}}{i}
$$
4. **Plug in the known values:**
$$
5000 = pmt \times \frac{1 - (1 + 0.01)^{-36}}{0.01}
$$
5. **Calculate the bracket term:**
First compute $(1 + 0.01)^{-36}$:
$$
(1.01)^{-36} = \frac{1}{(1.01)^{36}}
$$
Using a calculator, $(1.01)^{36} \approx 1.430768783$
Thus,
$$
(1.01)^{-36} = \frac{1}{1.430768783} \approx 0.699676$
6. **Compute the numerator:**
$$
1 - 0.699676 = 0.300324
$$
7. **Compute the entire fraction:**
$$
\frac{0.300324}{0.01} = 30.0324
$$
8. **Solve for $pmt$:**
$$
5000 = pmt \times 30.0324 \implies pmt = \frac{5000}{30.0324} \approx 166.53
$$
**Final answer:** The monthly payment should be approximately **166.53** to pay off the loan in 36 months including interest.