(1) Let the price of each piece of clothing be X yuan, which is derived from the meaning in the question:

40%x+30=70%x-60，

Solution: x=300,

A: The price of each dress is 300 yuan;

(2) This kind of clothing can get a discount of A at most.

300? a 10≥40%×300+30，

Solution: a=5,

A: In order to ensure no loss, this kind of clothing can be at most 50% off.