Kyrian went to the salon and paid $13.99 for a haircut. He left a 20% tip. How much was his total cost? Round to the nearest hundredth.
A.$15.99
B. $13.99
C. $14.27
D. $16.79
The tip amount can be found by multiplying the cost of the haircut by the tip rate: 13.99 * .2 = $<<13.99*.2=2.798>>2.798
Adding the cost of the haircut to the tip gives the total cost: 13.99 + 2.798 = $<<13.99+2.798=16.788>>16.79. Answer: \boxed{D}.