At the beginning of a month, a customer owes a credit card company $8480. In the middle of the month, the customer repays $A, where A < $8480, and at the end of the month the company adds interest at a rate of 6% of the outstanding debt. This process is repeated with the customer continuing to pay off the same amount, $A, each month. (a) Find the value of A for which the customer still owes $8480 at the start of each month.

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ISBN:9780470458365
Author:Erwin Kreyszig
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At the beginning of a month, a customer owes a credit card company $8480. In the middle of the month, the customer repays $A, where A < $8480, and at the end of the month the company adds interest at a rate of 6% of the outstanding debt. This process is repeated with the customer continuing to pay off the same amount, $A, each month.


(a) Find the value of A for which the customer still owes $8480 at the start of each month.


(b) If A = 1000, calculate the amount owing at the end of the eighth month.


(c) Show that the value of A for which the whole amount owing is exactly paid off after the nth payment is given by (see attached image)

d) Find the value of A if the debt is to be paid off exactly after two years.

8. At the beginning of a month, a customer owes a credit card company $8480. In the
middle of the month, the customer repays $A, where A < $8480, and at the end of the
month the company adds interest at a rate of 6% of the outstanding debt. This
is repeated with the customer continuing to pay off the same amount, $A, each month.
process
(a) Find the value of A for which the customer still owes $8480 at the start of each
month.
(b) If A = 1000, calculate the amount owing at the end of the eighth month.
(c) Show that the value of A for which the whole amount owing is exactly paid off after
the nth payment is given by
8480R"-'(R – 1)
A =
where R = 1.06
R" – 1
(d) Find the value of A if the debt is to be paid off exactly after two years.
Transcribed Image Text:8. At the beginning of a month, a customer owes a credit card company $8480. In the middle of the month, the customer repays $A, where A < $8480, and at the end of the month the company adds interest at a rate of 6% of the outstanding debt. This is repeated with the customer continuing to pay off the same amount, $A, each month. process (a) Find the value of A for which the customer still owes $8480 at the start of each month. (b) If A = 1000, calculate the amount owing at the end of the eighth month. (c) Show that the value of A for which the whole amount owing is exactly paid off after the nth payment is given by 8480R"-'(R – 1) A = where R = 1.06 R" – 1 (d) Find the value of A if the debt is to be paid off exactly after two years.
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