In order to determine how much does Allison pay for her utilitites, it is only necessary to calculate the percentage associated to utilities, given in the table (2.3%) of the Allison's earns ($6,500).
For calculating the 2.3% of 6,500, you simply multiply (2.3/100) by 6,500, just as follow:
(2.3/100)(6,500) = 149.5
Then, the 2.3% of $6,500 is $149.5. Hence, Allison pay $149 for her utilities