That's going to depend on all of the following:
-- what interest rate you can find
-- how often the interest on the investment is compounded
-- how you take your 40,000 annually ... how much and how often during the year.
You haven't included any of that information in the question, so no answer is possible.
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You need to invest 42027.98
The total interest would be 73606.07 dollars, approx.
7,398,000
6947.91 will be sufficient.
6.1% = 0.061(1.061)20 = 3.268193Investment = 600,000 / 3.268193 = $ 183,587.70