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Lanny's credit card has an APR of [tex]$33\%$[/tex], calculated on the previous monthly balance. His credit card record for the last 7 months is shown in the table below.

\begin{tabular}{ccccccc}
\hline \begin{tabular}{l}
End of \\
month
\end{tabular} & \begin{tabular}{c}
Previous \\
balance
\end{tabular} & \begin{tabular}{c}
New \\
charges
\end{tabular} & \begin{tabular}{c}
Payment \\
received
\end{tabular} & \begin{tabular}{c}
Finance \\
charges
\end{tabular} & \begin{tabular}{c}
Principal \\
paid
\end{tabular} & \begin{tabular}{c}
New \\
balance
\end{tabular} \\
\hline
1 & [tex]$\$[/tex]0.00[tex]$ & $[/tex]\[tex]$47.00$[/tex] & [tex]$\$[/tex]0.00[tex]$ & $[/tex]\[tex]$0.00$[/tex] & [tex]$\$[/tex]0.00[tex]$ & $[/tex]\[tex]$47.00$[/tex] \\
2 & [tex]$\$[/tex]47.00[tex]$ & $[/tex]\[tex]$182.00$[/tex] & [tex]$\$[/tex]44.22[tex]$ & $[/tex]\[tex]$1.29$[/tex] & [tex]$\$[/tex]42.93[tex]$ & $[/tex]\[tex]$186.07$[/tex] \\
3 & [tex]$\$[/tex]186.07[tex]$ & $[/tex]\[tex]$34.00$[/tex] & [tex]$\$[/tex]225.19[tex]$ & $[/tex]\[tex]$5.12$[/tex] & [tex]$\$[/tex]220.07[tex]$ & $[/tex]\[tex]$0.00$[/tex] \\
4 & [tex]$\$[/tex]0.00[tex]$ & $[/tex]\[tex]$98.00$[/tex] & [tex]$\$[/tex]69.43[tex]$ & $[/tex]\[tex]$0.00$[/tex] & [tex]$\$[/tex]69.43[tex]$ & $[/tex]\[tex]$28.57$[/tex] \\
5 & [tex]$\$[/tex]28.57[tex]$ & $[/tex]\[tex]$101.00$[/tex] & [tex]$\$[/tex]22.98[tex]$ & $[/tex]\[tex]$0.79$[/tex] & [tex]$\$[/tex]22.19[tex]$ & $[/tex]\[tex]$107.38$[/tex] \\
6 & [tex]$\$[/tex]107.38[tex]$ & $[/tex]\[tex]$21.00$[/tex] & [tex]$\$[/tex]57.00[tex]$ & $[/tex]\[tex]$2.95$[/tex] & [tex]$\$[/tex]54.05[tex]$ & $[/tex]\[tex]$74.33$[/tex] \\
7 & [tex]$\$[/tex]74.33[tex]$ & $[/tex]\[tex]$99.00$[/tex] & [tex]$\$[/tex]91.98[tex]$ & $[/tex]\[tex]$2.04$[/tex] & [tex]$\$[/tex]89.94[tex]$ & $[/tex]?[tex]$ \\
\hline
\end{tabular}

What is the new balance at the end of month 7?

A. $[/tex]\[tex]$99.00$[/tex]

B. [tex]$\$[/tex]91.98[tex]$

C. $[/tex]\[tex]$74.43$[/tex]

D. [tex]$\$[/tex]83.39$

Sagot :

To find the new balance at the end of month 7, we need to follow these steps:

1. Identify the given data for month 7:
- Previous balance: \[tex]$74.33 - New charges: \$[/tex]99.00
- Payment received: \[tex]$91.98 - Finance charges: \$[/tex]2.04

2. Calculate the principal paid:
The principal paid is the portion of the payment that goes towards reducing the balance, not including finance charges. This can be calculated as:
[tex]\[ \text{Principal paid} = \text{Payment received} - \text{Finance charges} \][/tex]
Substituting the values:
[tex]\[ \text{Principal paid} = 91.98 - 2.04 = 89.94 \][/tex]

3. Calculate the new balance:
The new balance is found by taking the previous balance, adding new charges, subtracting the payment received, and then adding the finance charges:
[tex]\[ \text{New balance} = \text{Previous balance} + \text{New charges} - \text{Payment received} + \text{Finance charges} \][/tex]
Substituting the values:
[tex]\[ \text{New balance} = 74.33 + 99.00 - 91.98 + 2.04 \][/tex]
Simplifying further:
[tex]\[ \text{New balance} = 74.33 + 99.00 - 91.98 + 2.04 = 83.39 \][/tex]

Thus, the new balance at the end of month 7 is \[tex]$83.39. So, the correct answer is: D. \$[/tex]83.39