Carlie needed a personal computer $($PC$)$ for school. After some searching, she was down to two possibilities. One she had found in a national franchised computer store, where she could purchase a brand new PC for $$850$ with a one$-$year guarantee. But she was intrigued by a second possibility: a local charity store was offering a used machine that had been donated $($exactly the same model as in the store$)$ for $$550.$

Carlie talked to a computer repair specialist, who said the principal problem with the used model of PC was the hard drive, which was prone to failure: he estimated that $64\%$ of the PCs of this model and age would require a new drive. He offered to test the computer and check the condition of the drive for $$50.$ If the drive was no good, a new drive could be fitted for $$260$ and would be guaranteed for one year. He added a qualification that his testing was not perfect: about $29\%$ of drives that passed his testing failed soon afterwards requiring a new drive $($$$260)$ plus a service charge of $$95$ for diagnosing the problem.

Calculate the expected cost associated to buy the used PC from the charity store if Carlie decides to test the PC for a possible hard drive failure. Where relevant, present your answer rounded to two decimal places.