The bill for dinner totaled $56 before tax and tip. The restaurant added a 6 percent sales tax. If Sandra wants to include a 16 percent tip calculated on the bill before sales tax is added, what is the total cost of the dinner?

The sales tax is 6% of $56, or $3.36, and the tip is 16% of the pre-tax $56, or $8.96. Add both charges to the original bill: $56 + $3.36 + $8.96 = $68.32. The total cost is $68.32, choice C.

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