Philip P. answered 10/02/14
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A = P*(1 + r)t
Where:
A = the final amount = $80,000
P = the Principle or initial investment = the unknown
r = annual interest rate expressed as a decimal = 3% = 0.03
t = years = 15
$80,000 = P*(1 + 0.03)15
$80,000 = P*(1.03)15
$80,000 = P*(1.558)
Solve for P.