the first store, or store1, has the best deal. each shirt is basically $11 (when you buy 2), where store 2 sells each shirt (i already put the discount) at $11.70. basically twelve dollars.
You would save $1.40 if you buy from store 1.
B: no it doesn't, store 3 sells its shirts at $11.53 each.
i hope this helps. (○^▽^○)