Answer:
$300.
Explanation:
Let x represent original cost of each hard drive.
We have been given that IBM states that it makes a 30% profit over its expenses for producing hard drives.
The cost of each hard drive after profit would be x plus 30% of x.



We have been given that IBM sells each hard drive for $390. We can represent this information in an equation as:



Therefore, the original cost of each hard drive is $300.