Posted by **Nicole** on Sunday, November 15, 2009 at 12:56pm.

Barbara knows that she will need to buy a new car in 4 years. The car will cost $15,000 by then. How much should she invest now at 10%, compounded quarterly, so that she will have enough to buy a new car? Round to the nearest cent.

- math -
**drwls**, Sunday, November 15, 2009 at 1:41pm
Require that X*(1.025)^16 = 15,000.

X is the initial amount that you will need to invest.

The 1.025 is the factor by which balance increases by every 3 months. It does this 16 times in 4 years.

You can use logs to get the answer. I will use base 10 logs. (The base does not matter, as long as you are consistent and use the same log base on both sides of the equation)

log 15000/X = 16 log 1.025 = 0.1715818

15,000/X = 1.4845056

X = $10,104.37

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