Question 207492
what lump sum should be invested today at 8% compounded 
semiannually to yield 26000
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A(t) = P(1+(r/n))^(nt)
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26000 = P(1+(0.08/2))^(2t)
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You have two unknown variables, P and t.
You cannot solve for "P" unless you know t.
Cheers,
Stan H.