It should be 23.625 dollars
a. Use the inclusion/exclusion principle.

b. By definition of conditional probability,

The Corrected Problem is :
2:x and 12:18 identify the value of x that makes each pair of ratios equivalent .
Solution:
If a pair of Ratios are equivalent then we can write

Hello,
Here is your answer:
The proper answer to this question is "37.5".
Your answer is 37.5!
If you need anymore help feel free to ask me!
Hope this helps!