Identify linear or Exponential function

A clothing store discounts items on a regular schedule. Each week, the price of an item is reduced. The prices for one item are in the table below. Week 0 is the starting price of the item.

Determine a linear or exponential equation that represents the relationship between the week and the price of the item.

1. Create a graph of the data.
   
2. Determine if a linear or exponential equation could represent the data.
   
3. Find the common ratio between the terms.
   
4. Use the value of the equation at $x$ = 0 and the common ratio to write an equation to represent the relationship.