Solution: (1) The money saved by customer B for buying two boxes of eggs is: 2× (14- 12) = 4 (yuan),

The money wasted by 20 bad eggs lost by customer B is ×20=8 (yuan).

Because four dollars.

(2) Suppose customer A bought X boxes of eggs.

12x=2× 14x﹣96，

To understand this equation, x=6,

6×30÷ 18= 10 (pieces).