Hailey paid $13 dollars for 1 3/7 kg of sliced salami.

Is the question how much it cost per kg?

If so, divide $13 by 1 3/7 kg.

13/(1 3/7) = 13/(10/7) = 13 * 7/10 = 91/10 = 9 1/10

Answer is 9 1/10 dollars per kg.
(Assuming I guessed your question correctly.)