To find the total cost of Karen's haircut including the tip, you first need to calculate the tip amount.
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Calculate the tip:
- Tip = 20% of $13.99
- Tip = 0.20 × 13.99 = $2.798
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Add the tip to the original cost:
- Total Cost = Original Cost + Tip
- Total Cost = $13.99 + $2.798 = $16.788
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Round to the nearest hundred dollars and 27 cents:
- Rounding $16.788 gives us $16.79.
Therefore, the answer is d) $16.79.