Posted by Naimy on Monday, February 16, 2009 at 8:06pm.
Suppose you deposit $400 in an account that earns 0.75 percent each quarter. You make no withdrawals from the account and deposit no more money into the account. How much money will accumulate after 2.5 years?

Math  Reiny, Monday, February 16, 2009 at 8:22pm
how about
400(1.075)^10 ?
or $824.41

Math  Ms. Sue, Monday, February 16, 2009 at 8:40pm
At 0.75 percent, I don't think you'd more than double your money in just 2.5 years.
I got a different answer. I used 0.0075 as the multiplier and figured it the long way  quarter by quarter.
In the first quarter you'd earn $3.00. Add that to the original 400 and again multiply by 0.0075. At the end of the second quarter, you'd have $406.02.
Finally, by the end of the 10th quarter, I got a total of $431.03.

Ms Sue is right  Math  Reiny, Monday, February 16, 2009 at 10:58pm
of course!
I left out a zero, and then punched in that wrong value in my calculator, without thinking about the answer.
should have been
400(1.0075)^10
= 431.03
thanks for catching that

Math  Ms. Sue, Monday, February 16, 2009 at 11:06pm
You're welcome, Reiny.
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