Greetings!
Answer:
11 cans cost $9.57
Explanation:
There are two ways of doing this, one being the longer and the other being the shorter.
The shorter one is simply multiplying the number by the new number over 5:

This works because this finds the amount the 5 has increased from 5 to 11 and muliplies the number by this.
= 9.57
So 11 cans cost $9.57
Hope this helps!