document.write( "Question 585221: Do you know what formula to use in solving this problem? Also could I get an example of the formula being applied to the question? Here is the question. You deposit $40 at the end of every six months into an annuity with 5% interest compounded semiannually. How much interest will have accumulated after 25 years? Do not round until the final answer. Then round to the nearest dollar as needed. \n" ); document.write( "
Algebra.Com's Answer #373397 by ankor@dixie-net.com(22740)\"\" \"About 
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Do you know what formula to use in solving this problem? Also could I get an example of the formula being applied to the question? Here is the question. You deposit $40 at the end of every six months into an annuity with 5% interest compounded semiannually. How much interest will have accumulated after 25 years? Do not round until the final answer. Then round to the nearest dollar as needed.
\n" ); document.write( ":
\n" ); document.write( "A Annuity formula: FV = P * \"%28%281%2Br%29%5En-1%29%2Fr\"; where
\n" ); document.write( "FV = final value
\n" ); document.write( "P = payment
\n" ); document.write( "r = interest rate (per period)
\n" ); document.write( "n = number of periods
\n" ); document.write( ":
\n" ); document.write( "In this example
\n" ); document.write( "p = 40
\n" ); document.write( "r = .05/2 = .025 interest rate for 6 mo
\n" ); document.write( "n = 2 * 25 = 50 periods
\n" ); document.write( ":
\n" ); document.write( "FV = 40 * \"%28%281%2B.025%29%5E50-1%29%2F.025\"
\n" ); document.write( "FV = 40 * \"%28%281.025%29%5E50-1%29%2F.025\"
\n" ); document.write( "FV = 40 * \"%28%283.43711-1%29%29%2F.025\"
\n" ); document.write( "FV = 40 * \"%28%282.43711%29%29%2F.025\"
\n" ); document.write( "FV = 40 * 97.58435
\n" ); document.write( "FV = $3899.37 is the final value
\n" ); document.write( "However you wanted to know how much of this was interest
\n" ); document.write( "The amt you paid into this in 50 payments, subtracted from the final value
\n" ); document.write( "Int = 3899.37 - (40*50)
\n" ); document.write( "Int = $1899.37 was interest
\n" ); document.write( "
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