At a music store, the price of speakers is 245, plus the sales tax of 6.5%. what is the total cost of the speakers including the sales tax?

If you see the question, you will find that all the necessary information's are already given in the question. Based on these information's it is possible to find the required answer.
Price of the speaker at the music store = 245
Percentage of sales tax that has to be added = 6.5%
Amount of sales tax that has to be added = (6.5/100) * 245
                                                                   = 1592.5/100
                                                                   = 15.925 dollars
Total cost of the speakers including sales tax = (245 + 15.925) dollars
                                                                         = 260.925 dollars
So the total cost of the speakers after including sales tax is $260.92

Where the answer choices?