Martha has $100 in a savings account. every month, she deposits $250 into her savings account. she sees an advertisement for a new refrigerator that’s available for $1,200. she calls the store and talks to a salesperson, who says she can purchase the refrigerator interest free by paying $80 per month until the balance of the purchase is paid. at the end of months, she still has owes $720 for the refrigerator.

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.