Question 791684
$200,000 = $32,000 * [(1 + r)^5 - 1/r] 
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((1 + r)^5 - 1)/r = 200/32
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There's no algebraic solution.
You have to use numerical methods, such as Newton-Raphson, or graphical methods.
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Using a graph, r =~ 0.111789081446046 =~ 11.178%