Posted by **Jus** on Sunday, May 17, 2009 at 8:16pm.

An investment pays 3.5 percent interest, compounded quarterly.

a) write an equation to express the amount A, of the investment as a function of time, t, in years.

The answer is

A(t)=P(1.00875)^4t

Ok, but my question is this:

Why isn't the equation

A(t)=P(1.035)^4t, if the interest percent is 3.5% wouldnt it make sense that it's 1.035 in the equation and not 1.00875. Could someone clarify for me if I am right or wrong, and why.

- Exponential Word Problem -
**Damon**, Sunday, May 17, 2009 at 8:21pm
The 3.5% is expressed PER YEAR by convention, thus 3.5 / 4 = .875% per quarter year compounding period.

- Exponential Word Problem -
**Damon**, Sunday, May 17, 2009 at 8:35pm
Note that 1.00875^4 = 1.0355

so

That 3.5% is really 3.55% in effect because it is compounded quarterly.

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