The cost of the article is $649, since we are paying not only the cost of the phone but taxes we have to add the amount payed in taxes to the $649, we can calculate the taxes by multiplying the sales tax rate, 0.0825 (8.25%), and the $649, then we get:
taxes = 0.0825×649 = 53.5425
By adding $53.5425 to the initial $649, we get how much did we pay in total, then we get:
Total cost = $702.5425
