The amount Brandy spends on gas each month is; $68.77
Since, if follows from the task content that Brandy's mileage per gallon each month is given as; 18.1.
If follows that for 500 miles travelling, the quantity of gas used is; 500/18.1 = 27.62gallons.
Hence, since gas costs $2.49 per gallon, the amount she spends on gas each month is; 2.49 × 27.62 = $68.77
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