To find the total cost of Kyian's haircut including the tip, follow these steps:
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Calculate the tip: \[ \text{Tip} = \text{Haircut Cost} \times \text{Tip Percentage} = 13.99 \times 0.20 = 2.798 \]
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Round the tip to the nearest hundredth: \[ \text{Rounded Tip} = 2.80 \]
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Calculate the total cost: \[ \text{Total Cost} = \text{Haircut Cost} + \text{Tip} = 13.99 + 2.80 = 16.79 \]
So, Kyian's total cost, rounded to the nearest hundredth, is $16.79.