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4.(b) In Figure 3, the amounts per year oscillate between $5,000 in one year and $2,500 in the next. If this series continues forever, compute the rate of return on the $40,000 investment. [10 points] 5.000 5,000 5,000 5,000 Li\" 1 3\"\" l 2i\" l 40.000 Figure 3: Cash Flow Figure for Question 4(b)