SOLUTION: IBM states that it makes a 30% profit over its expenses for producing hard drives. IBM sells each hard drive for $390. How much does it cost IBM to make each hard drive?

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Let x be the value under the question, in dollars.


Then the condition says that


    x + 0.3x = 390  dollars,


    1.3x     = 390


       x     =  = 300   dollars.    ANSWER