i'm stumped. help me find X

A=B(1+X)^n

I've been trying to figure it out for the past hour. It is basically the time value of money equation. the unknown is the rate (X)
A=new value
B=old value
n=# of periods

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Ben
1987 190d 2.5Turbo

Dear Algebra,

I don't know where your X is, nor do I care Y they haven't come back.

Yours truly,

Me

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1987 560SL
85,000 miles

man, that is profound!

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Ben
1987 190d 2.5Turbo

can you do

take the nth root of (a/b) -1 = x

??

its been a while for me too.

LOL

This would be a problem I'd have my daughter look at later tonight to see if it makes sense to her. She's in advanced Algebra II at her high school.

I'll let you know what she comes up with...

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1987 560SL
85,000 miles

no. i tried that. i suspect that both sides have to be raised to the "e". just not sure.

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Ben
1987 190d 2.5Turbo

That's what I got also.

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1986 300SDL, 362K
1984 300D, 138K

that's gotta be it. i just could not use the calculator properly. thanks guys. you rock

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Ben
1987 190d 2.5Turbo

nope. it will take an algebra genius to get this right.

if A=121, B=100, n=2 then X=10%

i can use a HP 12c financial calculator but I can't figure out the algebra part

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Ben
1987 190d 2.5Turbo

If you plug those numbers into the equation TheDon offered, doesn't it work for you? It does for me.

Most TI calculators you can enter direct and it scrambles the eggs for you and pops out the answer.

Just quickly, since I hate these problems.

EDIT: nevermind, I got it... x=(a/b)^(1/n)-1

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Onus probandi incumbit ei qui dicit, non ei qui negat

I recondition w123/w126/w124/w140/r107/r129/ steering boxes!


1984 300D "Elsa" odo reset 6/2011 147k
1983 300TD "Mitzi" ~268k OM603 powered
1995 E300 "Adelheid" 262k [Sold]

pure genius. that is it!!!!

please show me how you did it.

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Ben
1987 190d 2.5Turbo

If you have Excel on your computer, you can simply type any formula you want into the cells and then plug values in and it will do the calculations for you.

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-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250

fyi, there is now an iphone app for the HP12c. It's about 3 bucks my partner told me. He uses it all the time
(I still use the 19B "booklet" It works!)