an office building has three air - conditioning units, one for each office. each unit runs only when…

an office building has three air - conditioning units, one for each office. each unit runs only when employees are working. the tables below show the number of hours employees worked at each office over a three - month period and the total air - conditioning electric costs for the entire office for each month.\n\nnumber of hours worked\n| | unit a | unit b | unit c |\n|--|--|--|--|\n| june | 184 | 207 | 276 |\n| july | 174 | 198 | 264 |\n| august | 168 | 189 | 242 |\n\ntotal air conditioning electric costs\n| | |\n|--|--|\n| june | $142.60 |\n| july | $135.96 |\n| august | $128.30 |\n\nhow much does it cost to run unit a per hour?

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