Using the high-low method and the information below,compute the variable cost per telephone hour for PSA Corporation. 
Definitions:
Unearned Fees
Revenue received by a company for services yet to be performed, recognized as a liability until the services are provided.
Fees Earned
Income received for services provided by a company or individual.
Adjusting Entry
A journal entry made in accounting to adjust income or expense accounts so they align with the accrual method of accounting.
Calendar-Year
A one-year period that begins on January 1 and ends on December 31, used for financial and taxation purposes.
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