Question 26 (1 point) Next summer, Doris will sell tubes of "Dor" sunscreen at her beachside stand. Her supplier only delivers once, at the beginning of the summer. Doris estimates that demand for the entire summer will follow a normal distribution with a mean of 250 tubes and a standard deviation of 50. The supplier charges her $10 per tube. Doris will sell them for $15 each. At the end of the summer, any leftover stock will be liquidated at half-price. How many tubes should Doris order to minimize her expected costs? 108 O 129 300 272