
Algebra PreAlgebra and Basic Algebra Math Forum 
 LinkBack  Thread Tools  Display Modes 
September 12th, 2011, 09:57 PM  #1 
Newbie Joined: Aug 2011 Posts: 9 Thanks: 0  Is my answer key wrong?
The Problem: In 2003, the US national debt was about $7 trillion. If payments were made at the rate of $1,000 per second, how many years would it take to pay off the debt, assuming that no interest were charged? (Note: 1 year = 3.156*10^7 seconds) I got 221.8 years, but the answer key says 100 years... Don't see how I'm wrong though. 
September 12th, 2011, 11:56 PM  #2 
Senior Member Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,206 Thanks: 513 Math Focus: Calculus/ODEs  Re: Is my answer key wrong?
We can find the time t in years from: I'd say you are correct! 

Tags 
answer, key, wrong 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Is the answer key wrong?  davedave  Algebra  2  June 18th, 2012 04:55 AM 
Could the answer be wrong?  davedave  Calculus  6  April 24th, 2012 11:25 AM 
Is my answer wrong?  najaa  Algebra  6  March 13th, 2012 04:04 AM 
how is my answer wrong?  theQuake  Real Analysis  2  October 29th, 2008 09:12 AM 
Could the answer be wrong?  davedave  Algebra  0  December 31st, 1969 04:00 PM 