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Many credit card companies charge a compound interest rate of 1.8% per month on a credit card balance. Miriam owes $650 on a credit card. If she makes no purchases or payments, she will go more and more into debt.

Which of the following sequences describes her increasing monthly balance?

A. 650.00, 650.18, 650.36, 650.54, 650.72, ...
B. 650.00, 661.70, 673.40, 685.10, 696.80, ...
C. 650.00, 767.00, 905.06, 1,067.97, 1,260.21, ...
D. 650.00, 661.70, 673.61, 685.74, 698.08, ...
E. 650.00, 767.00, 884.00, 1,001.00, 1,118.00, ...

Answer :

The correct sequence showing the increasing balance is Option D: 650.00, 661.70, 673.61, 685.74, 698.08, and so on.

The sequence that describes Miriam's increasing monthly balance due to compound interest needs to reflect the compounding effect of the 1.8% interest rate applied each month. With a starting balance of $650, after one month with the interest rate of 1.8%, the new balance would be $650 * (1 + 0.018) = $650 * 1.018 = $661.70.

To find the subsequent months' balances, we continue to multiply the previous balance by 1.018 (which is 1 + 1.8%). For example, the balance after the second month would be $661.70 imes 1.018 = $673.61, and so on. This process is known as geometric progression where each term after the first is found by multiplying the previous term by a fixed, non-zero number called the common ratio (in this case, 1.018).

Thus, the correct sequence that represents Miriam's increasing debt is Option D: 650.00, 661.70, 673.61, 685.74, 698.08, and so on.

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