Nancy Martinez purchased a used car for $13,295 by paying cash. If she had financed the car with an installment plan, she would have had to pay a $5,000 down payment and 36 monthly installments of $355 each. How much did she save by paying cash?
$4,970
$4,684
$4,562
$4,485
None of these choices are correct.

Naruto is choosing between two venues that will deliver food to his house. with probability 1/3 he will choose ramen mania (r), and with probability 2/3 he will choose sushi (s). if he chooses r, 15 minutes after making the call, the remaining time it takes the food to arrive is exponentially distributed with average 10 minutes. if he orders s, 10 minutes after making the call, the time it takes the food to arrive is exponentially distributed with an average of 12 minutes. given that he has already waited 25 minutes after calling, and the food has not arrived, what is the probability that he ordered from r? i am really stuck on how to set this up, so if you could be extra clear, that would be super ! in advance