# algebra

posted by snow

2,200 after 3 years if the account pays 8.4%

i have no clue what this is

1. MathMate

What 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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