The store manager recalls periodically selling out of sunscreen during the last busy season. HQ also shared online customer reviews which mentioned the store not having any sunscreen and the level of frustration it caused.The store manager would like to use a service level of $99\%$ for the upcoming busy season but worries about the increased costs associated with this change.How much extra annually would changing to a $99\%$ service level for sunscreen cost?What service level would you recommend?Why?