# Math/Finance Majors

1. Mar 19, 2008

### rocomath

Are there any Math/Finance Majors in here? I am currently a Math major, but I am also thinking about doing a double-major with Finance. I start this summer, so I still have time.

2. Sep 30, 2008

### Makman

Hi, I'm new to this site and may be in the wrong place. If so, kindly direct me to the right place.
I wold like to solve the following question:
If the total interest earned on an investment at 8.2% compounded semiannually for 8.5 years was $1,175.98, what was the original investment? I would like to know what formula(s) to use. Thank you in advance. Makman 3. Oct 2, 2008 ### jcsolis You have to use the formula P=A(1+r/m)^-(m*t) A is you actual ammount r is your rate m is your compound, in your case m will be 2 t is the time in years Remember that the formula has a negative exponent! 4. Oct 2, 2008 ### Makman Thank you! Yes, I worked it out.$1,200.

Much appreciated.