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Rafa Company prepares a flexible budget at three different levels of activity: 50,000 units, 55,000 units, and 60,000 units. The company determined that the standard volume of output is 110,000 machine hours for 55,000 units produced, and machine hours are budgeted at $2 per unit. At this level of activity, its total variable overhead is $275,000, and its total fixed overhead costs is $440,000. What is Rafa Companys standard overhead rate per machine hour at the standard volume of output?