document.write( "Question 982542: The time it takes to double the balance in an account varies inversely with the intrest rate. If you invest $1000 at 6% it will take 12 years to double your money. Find the time it will take to double your money at 4%. \n" ); document.write( "

Algebra.Com's Answer #603410 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

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The time it takes to double the balance in an account varies inversely with the interest rate.
\n" ); document.write( " If you invest $1000 at 6% it will take 12 years to double your money.
\n" ); document.write( " Find the time it will take to double your money at 4%.
\n" ); document.write( ":
\n" ); document.write( "let t = time to double at 4%
\n" ); document.write( ":
\n" ); document.write( "An inverse relationship equation between the interest and the time to double
\n" ); document.write( " $\"t%2F12\"$ = $\"6%2F4\"$
\n" ); document.write( "cross multiply
\n" ); document.write( "4t = 12 * 6
\n" ); document.write( "4t = 72
\n" ); document.write( "t = 72/4
\n" ); document.write( "t = 18 yrs to double at 4% \n" ); document.write( "

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