Use IRR method only. The local police department is considering two types of sidearms for its officers. The Glock

$40$ costs $$400$ apiece and has a life of $5$ years. The other option is a Sauer $45$ that costs

$$800$ and has a $10-$year life. The Sauer pistol has a residual value of $$200$ at the end of its

$10-$year service life. Assume repeatability and compute the internal rate of return on the

incremental cash flow of the two pistols. If the department uses a MARR of $5\%$ per year,

is the Sauer $45$ the better choice?