You have
$750,000
in an IRA (Individual Retirement Account) at the time you retire. You have the option of investing this money in two funds: Fund A pays
1.71.7%
annually and Fund B pays
6.76.7%
annually.
How should you divide your money between Fund A and Fund B to produce an annual interest income of
$42,250?
Total Investment available = $750,000
Let Investment in Fund A = IA = x
Investment in Fund B = IB = $750,000 - x
Interest for Fund A = rA = 1.7%
Interest for Fund B = rB = 6.7%
Annual Interest Income = $42,250
Annual Interest income for the funds should equal to $42,250
Annual Interest Income = [IA * rA] + [IB * rB]
$42,250 = [x * 1.7%] + [ ($750,000 - x) * 6.7%]
$42,250 = 0.017 x + $50,250 - 0.067 x
0.05 x = $8,000
x = $160,000
Investment in Fund A = $160,000
Investment in Fund B = $750,000 - x = $750,000 - $160,000 = $590,000
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