Suppose that papers for a newspaper stand cost $$0\mathrm{.}40$ and sell for $$0\mathrm{.}80.$ They currently have no salvage value. If the stand owner is able to find an outlet that would provide a salvege value of $$0\mathrm{.}10$ paper what would be the increase in senice level?

$\mathrm{.}05$

$\mathrm{.}07$

$0\mathrm{.}2$

$0\mathrm{.}1$

$0$