If you're just asking about the tortilla 'wraps', it's 7 syns per wrap.
If you're asking about how much each burrito would be once it's made up, you need to take the syns for one tortilla (7), then add the correct number of syns for the salsa and the spice mix depending on portion. for example, if the kit makes up 4 burritos, it would be 7 (tortilla) + 2 (for salsa and spice mix) = 9 syns per burrito.
However, this depends on how you split the mix, and if all the ingredients you use are free.
Hope that makes sense and helps a bit...