To determine how many weeks of inventory you have, follow these steps:
1. Identify the given values:
- Units sold per week: 20 units
- Units in inventory: 100 units
2. Understand the relationship between the given values:
- The number of weeks of inventory can be found by dividing the units in inventory by the units sold per week.
3. Set up the problem as a division:
[tex]\[
\text{Weeks of inventory} = \frac{\text{Units in inventory}}{\text{Units sold per week}}
\][/tex]
4. Plug in the values:
[tex]\[
\text{Weeks of inventory} = \frac{100}{20}
\][/tex]
5. Perform the division:
[tex]\[
\text{Weeks of inventory} = 5
\][/tex]
Therefore, you have 5 weeks of inventory, which corresponds to answer choice (a) 5.