Search All of the Math Forum:
Views expressed in these public forums are not endorsed by
NCTM or The Math Forum.


Math Forum
»
Discussions
»
Inactive
»
k12.ed.math
Notice: We are no longer accepting new posts, but the forums will continue to be readable.
Topic:
Converting pesos to dollars and vs versa
Replies:
6
Last Post:
Jul 26, 2005 11:02 PM




Re: Converting pesos to dollars and vs versa
Posted:
Jul 26, 2005 1:03 PM


On 20050725, DanielLee <dlh3648@yahoo.com> wrote: > Lets say (for example) that I convert $1,000 dollars to Mexican pesos > at 11% and end up with $11,000 pesos. > > Now lets say I want to convert $11,000 pesos to dollars at the same > rate. The way I am doing it now would be to multiply the $11,000 pesos > x .090 which gives me $990 dollars, I am missing $10 dollars. > > How do I figure out what the peso to dollar exchange rate is using the > known dollar to peso exchange rate? I want to change pesos to dollars > at the same rate I changed dollars to pesos.
Using % is a poor way to think of conversions. These are simple ratios: pesos/dollars = 11 so dollars/pesos = 1/11 =approx 0.090909
$1,000 dollars * 11 pesos/dollars = $11,000 pesos $11,000 pesos / (11 pesos/dollars) = $1,000 dollars
$11,000 pesos * (0.090909 dollars/pesos) = $999.999 =approx $1000
 Kevin Karplus karplus@soe.ucsc.edu http://www.soe.ucsc.edu/~karplus Professor of Biomolecular Engineering, University of California, Santa Cruz Undergraduate and Graduate Director, Bioinformatics (Senior member, IEEE) (Board of Directors, ISCB) life member (LAB, Adventure Cycling, American Youth Hostels) Effective Cycling Instructor #218ck (lapsed) Affiliations for identification only.
 submissions: post to k12.ed.math or email to k12math@k12groups.org private email to the k12.ed.math moderator: kemmoderator@k12groups.org newsgroup website: http://www.thinkspot.net/k12math/ newsgroup charter: http://www.thinkspot.net/k12math/charter.html



