Bob ordered x packs of Greek yogurt.
40% of the packs were expired, which means 0.4x packs were expired.
He decided to return those packs, so he was refunded for 0.4x packs.
Each pack was $12, so he was refunded $12 * 0.4x = $4.8x.
We are given that he was refunded $384, so we can write: $4.8x = $384.
Dividing both sides by $4.8, we get: x = 80.
The value of x is 80.
#### 80
The answer is: 80
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
Bob ordered x packs of Greek yogurt from Costco to use for the month. However, when the delivery arrived, he realized 40% of the packs were expired. He decided to return those packs. If each pack was $12, how much was Bob refunded for the expired product?
If we know the answer to the above question is 384, what is the value of unknown variable x?

### Answer:
