Hey Hannah!
So, from starting out with this (real word) problem, we know that this
Mila 
has $50 bucks in her wallet.
So,
![\left[\begin{array}{ccc}\boxed{50-15-20-5-10}\end{array}\right]](https://img.qammunity.org/2019/formulas/business/college/oyf136m01v98okvtpq06n4ok5ogsjxy8u2.png)
So, what she could really do, sense this would be business and that she would have to make up her mind in order to make the right choice so that she could leave the store with what she has.
The

thing to do in this situation is to
really look at what you have in your cart and to see if you really need some things.
For example: Have you ever went to a store and you put alot of stuff in your cart, and when you are about to leave you say, "do I really need this". It's that same in this case, the best thing to do is to see if she could possibly either lay the (t-shirt) down and buy the rest, or ask the dealer if she could make the other items prices lower. Those would be the two.
Hope this helps.
~Jurgen