The first volume of the fifth grade math summer homework 4 1 page answers to the first big question. Shop A buys 10 delivers 1 B stores are full of 20 yuan with a 10% discount and Shop C is full of 30 yuan with a 20% discount. Store a:10x2 = available in 20 yuan 1 1. If you buy 1 1, each 1.82 yuan.

B10x2x9/10 =18 yuan each 1.8 yuan.

C 10X2 =20 yuan can't give a 20% discount if it is not satisfied with 30 yuan.

One store is the most cost-effective