A concert promoter prints T-shirts specifically for that concert date and artist, and sells them at the concession store

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A concert promoter prints T-shirts specifically for that concert
date and artist, and sells them at the concession store outside the
performance arena. The T-shirts cost $50 a piece to make and stock
at the event. The selling price is $200 a piece, but a royalty of
$75 has to be paid to the artist for each sale. Any unsold T-shirts
are sold off to an online marketplace at $25 a piece. The demand
for T-shirts is estimated having a mean of 350 and standard
deviation of 70.
What is the optimal service level for the promoter?
Group of answer choices
50%
38%
98%
65%
75%