In the newsvendor problem, the cost of each newspaper is $$1,$ and the newsvendor sells each newspaper at $$3.$ Any leftover will be sold at $$0\mathrm{.}2.$ What is the customer service level in this case?

Question $31$ options:

$0\mathrm{.}71$

$0\mathrm{.}83$

$0\mathrm{.}57$

$0\mathrm{.}28$