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15 August, 16:39

You ran a little short on your spring break vacation, so you put $1,000 on your credit card. you can only afford to make the minimum payment of $20 per month. the interest rate on the credit card is 1.5 percent per month. how long will you need to pay off the$1,000? how much interest will you pay?

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  1. 15 August, 16:54
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    Use the PV of an Annuity tables, where PV is $1,000, Annuity is $20, and Rate is 1.5%. But remember that the equation for this table is PV = Annuity x Factor. Since we know the PV and the Annuity, solve for the Factor.

    PV / Annuity = Factor, so $1,000 / $20 = 50 (the Factor). From the table, find where a Factor of 50 meets a rate of 1.5%. A factor of 49.9724 appears at 1.5% and 93 Periods.

    The formula for the PV of an Annuity is (1 - 1 / (1 + r) ^n) / r. So 1,000 = (1 - 1 / (1.015) ^n /.015.

    To solve for n gets too difficult
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