Solution: Suppose you buy 6 kilograms of pork. According to 4 yuan, a kilogram of beef is more expensive than a kilogram of pork, if you buy 6 kilograms of pork, you will get 4*6-2=22 yuan, while if you buy 7 kilograms of pork, you will get 8 yuan, so a kilogram of pork is.

(22-8)/(7-6)= 14 (yuan); So mom * * brought 14*7+8= 106 (yuan).

Answer: 4*6-2=22 (yuan)

(22-8)/(7-6)= 14 (yuan)

14*7+8= 106 (yuan)

A: Mom brought 106 yuan.