Sophie does 4 loads of laundry per week, so she uses 4 dryer sheets per week.
In a year, there are 52 weeks, so Sophie uses 4 x 52 = 208 dryer sheets per year.
A box of dryer sheets has 104 sheets, so Sophie would need 208 / 104 = 2 boxes of dryer sheets per year.
A box of dryer sheets costs $5.50, so Sophie would spend 2 x $5.50 = $11 per year on dryer sheets.
However, she was given wool dryer balls on her birthday, so she doesn't need to buy dryer sheets anymore.
Therefore, Sophie saves $11 per year not buying dryer sheets.
#### 11
The answer is: 11
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
Sophie does 4 loads of laundry a week and uses 1 dryer sheet per load.  A box of dryer sheets costs $5.50 and has 104 dryer sheets in a box.  On her birthday, she was given wool dryer balls to use instead of dryer sheets.  How much money does she save in a year not buying dryer sheets?

### Answer:
