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Topic: math in the news
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Andrew Janovsky

Posts: 36
Registered: 2/28/05
math in the news
Posted: May 27, 2009 11:39 AM
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A poster shown at the announcement of the new credit card bill shows the information given below.
Over a ten year cycle, a $50 sweater will have an actual cost of $456 and $1,000 in tuition will have an actual cost of $9,305.

To calculate the actual cost of $1000 in tuition over a ten year cycle at 24.99% use the formula 1000 x 1.2499^10.
To calculate the actual cost of a $50 sweater over a ten year cycle at 24.99% use the formula 50 x 1.2499^10.
Compare your results with the numbers in the poster.
Exponential growth problems are common on New York State mathematics Regents exams.



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