If investment and operating expenses are given as shown in the following Table, which alternative A or alternative B is more preferable? $($Judges based on present value. However, the discount rate is $5$ percent.$)$

$\backslash$table$[[$Year$,$Plan A$,$Plan B$],[0,50,30],[1,5,7\mathrm{.}5],[2,5,7\mathrm{.}5],[3,5,7\mathrm{.}5],[4,5,7\mathrm{.}5],[5,5,7\mathrm{.}5],[6,5,7\mathrm{.}5],[7,5,7\mathrm{.}5],[8,5,7\mathrm{.}5],[9,5,7\mathrm{.}5],[10,5,7\mathrm{.}5]]$