1800 Emerson students ate at the dining hall this week. 109 come down with gastrointestinal distress. 42 of the ill students reported eating at the salad bar. 67 of the ill students reported eating at the taco bar. The dining hall estimates that approximately 200 students ate at the salad bar; whereas the taco bar was frequented by 550 students. for those who ate at the salad bar and the taco bar. Which one (salad bar or taco bar) should investigators look at first in terms of potential risk factors?

Carla was trying to decide what to do saturday evening. she has $100 available to spend for the evening. she has narrowed her choices down to these events: braves game, a concert of an artist she likes, or the georgia aquarium. admission to the braves game is $25, hot dogs cost $10, sodas cost $5. the concert costs $25 for admission, $20 for a souvernir t-shirt, and $10 for a soda. the georgia aquarium has the show of a lifetime with an all you can eat and drink that costs $100. carla does not want to take any driving chances, so in addition to the cost of the aquarium, she will also need to pay for her uber/lyft, which is $15 each way. which option should carla choose if she wants to spend the least? based on that choice, what then is carla's oppotunity cost? fully explain your answer in at least one paragraph.