To calculate the total cost including an 18% tip on a food total of $28.00, follow these steps:
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Calculate 18% of $28.00: \[ 0.18 \times 28.00 = 5.04 \]
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Add the tip to the original food total: \[ 28.00 + 5.04 = 33.04 \]
So, 18% of $28.00 is $5.04, and the total cost will be $33.04.