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April 20, 2014

April 20, 2014

Posted by **snow** on Monday, January 11, 2010 at 8:44pm.

i have no clue what this is

- algebra -
**MathMate**, Monday, January 11, 2010 at 9:15pmWhat is the question?

It helps to post the complete question even though there is more typing to do.

I suppose the question requires you to calculate the original deposit (principal) three years ago.

At 8.4% p.a. compound interest,

$1000 will yield 1000*(1.084³) after three years, or $1273.76.

If the combined interest and principal after three years is $2200, the the principal can be calculated by proportion, namely

P=1000*(2200/1273.76)=$1727.17

So check if my assumptions correspond to those of the question. If not, please post the complete question.

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