1. The local police department is considering two types of sidearms for its officers. The Glock 40 costs $400 each and has a 4 year lifespan. The other option is a Sauer 45 that costs $800 and has a 12-year lifespan. The Sauer pistol has a $200 residual value at the end of its 12-year service life. Determine the better choice using the PW method and a runtime of 8 years. The department uses a 5% MARR.
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3. Three different methods can be used to recover by-product heavy metals from the effluent of a production site. The investment costs and revenues associated with each method are shown below. Assuming all methods have a 10-year lifetime and the company's MARR is 10% per year
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5.  Use the Annual Value Analysis to determine which method should be selected.
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7. Method 1	Method 2	Method 3
   Initial Cost, $	20.000	18.000	25.000
   Recovery Value, $	1.000	3.000	1.500
   Annual Income, $	5.000	5.000	7.000