Respuesta :

To figure out the cost including tax simply take the initial cost $5.68 and multiply it by .09 (which is 9%) to get

.5112. 

Add this number on top of the cost of the pizza 

5.68 + .5112 = $6.19 (rounded). 

I do not know how Joseph got $17.16. 
Okay, if the pizza costed you $5.68 plus 9% tax, the final price is written as $5.68 + (0.09 * $5.68) or 1.09 * $5.68 which would give you $6.912 which you would you have to approximate to $6.92. His error must have been some type of multiplaction error.

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