A local club is selling Christmas trees and deciding how many to stock for the month of December. If demand is normally distributed with a mean of $250$ and standard deviation

of $40,$ trees have no salvage value at the end of the month, trees cost $$20,$ and trees sell for $$50.$ If the club is able to find an outlet that would provide a salvage value of $$10$

per tree, what would be the change in service level?

A$.$ from $75\%$ previously to $70\%$

B$.$ from $60\%$ previously to $75\%$

C$.$ from $80\%$ previously to $60\%$

D$.$ from $70\%$ previously to $80\%$

E$.$ from $60\%$ previously to $80\%$