What interest rate must the investment earn

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1.A river discharges at a rate of 500 cfs into a lake. The water is drawn from the lake at a rate of 200 cfs. The surface area of the lake is 60 acres (1 acre = 43, 560 ft2). What is the rate of water rise in the lake in one day?

2.Determine the length of roadway that is in full superelevation for a four-lane expressway with a 60 mph design speed. The BC of the curve is at station 15+00 and has a minimum allowable radius. The curve delta is 25 degrees and 30’.

3.A mining firm makes annual deposits of $250,000 into a reclamation fund for 20 years. If the firm must have $10 million when the mine is closed;

what interest rate (%) must the investment earn?

Reference no: EM13550234

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