The following series of revenues and expenses in $1000 units were recorded by a mobile phone business. At a return rate of 10% per year, 

(a) Determine the net future worth in year 10.

(b) Did the owners make their expected 10% return? How do you know?

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Year Revenues, $ Expenses, $ -2500 1-4 700 -200 5-10 2000 -300