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Find the adjusted balance (principal) using the U.S. Rule (360 days) after the first payment.

[tex]\[
\begin{tabular}{|c|c|c|c|c|c|c|c|}
\hline
Principal & Rate & Total Time for Note & & Amount & & \begin{tabular}{c}
Partial Payment on \\ Day 90
\end{tabular} \\
\hline
& $11\%$ & 120 days & \$ & 7,000 & \$ & 1,200 \\
\hline
\end{tabular}
\][/tex]


Sagot :

To find the adjusted balance (principal) using the U.S. Rule, we need to follow a series of steps:

1. Calculate the interest for the first 90 days:

The formula for calculating simple interest is:
[tex]\[ I = P \times r \times \frac{t}{360} \][/tex]

Given:
- Principal ([tex]\(P\)[/tex]) = \[tex]$7,000 - Annual rate (\(r\)) = 11\% (or 0.11 as a decimal) - Time (\(t\)) = 90 days \[ I_{90} = 7000 \times 0.11 \times \frac{90}{360} \] Performing the calculation: \[ I_{90} = 192.5 \] Therefore, the interest for the first 90 days is \$[/tex]192.5.

2. Calculate the new principal after the partial payment:

We need to determine the principal after accounting for the accumulated interest and subtracting the partial payment.

- Partial payment = \[tex]$1,200 Adding the interest to the principal: \[ P_{\text{new}} = 7000 + 192.5 - 1200 \] Performing the calculation: \[ P_{\text{new}} = 5992.5 \] The new principal after the partial payment is \$[/tex]5,992.5.

3. Calculate the interest for the remaining period (30 days):

The remaining period after day 90 is [tex]\(120 - 90 = 30\)[/tex] days.

Using the interest formula again with the new principal:
[tex]\[ I_{30} = P_{\text{new}} \times r \times \frac{t_{\text{remaining}}}{360} \][/tex]

Given:
- New principal ([tex]\(P_{\text{new}}\)[/tex]) = \[tex]$5,992.5 - Annual rate (\(r\)) = 11\% (or 0.11 as a decimal) - Remaining time (\(t_{\text{remaining}}\)) = 30 days \[ I_{30} = 5992.5 \times 0.11 \times \frac{30}{360} \] Performing the calculation: \[ I_{30} = 54.93125 \] Therefore, the interest for the remaining 30 days is \$[/tex]54.93125.

4. Calculate the final adjusted balance:

The final adjusted balance is the new principal plus the interest accumulated over the remaining period.

[tex]\[ P_{\text{adjusted}} = P_{\text{new}} + I_{30} \][/tex]

Performing the calculation:
[tex]\[ P_{\text{adjusted}} = 5992.5 + 54.93125 \][/tex]

Therefore, the adjusted balance is:
[tex]\[ P_{\text{adjusted}} = 6047.43125 \][/tex]

So, the adjusted balance after the first payment on day 90 is \$6,047.43125.
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