1. "Love Home" supermarket launched promotional activities. Buying a box (24 boxes) of milk is 46.5 yuan, and buying a box (8 boxes) of milk at Renren Le Supermarket of the same brand is 18 yuan. Which supermarket has cheaper milk? How much cheaper?

2. Hangzhou Department Store sends 135 yuan gift certificate to 300 yuan; Yintai Department Store delivers 150 yuan gift certificate to 300 yuan; Xie Baiman is reduced by 300100; Hangzhou Building is on sale at a discount of 7.5%. I know my mother will definitely go shopping at night, but these stores have activities. Which is the most cost-effective for customers?

(1) gift certificate from Hangzhou Department Store 300 yuan 135 yuan, with a discount range of 3 1.03%, [135 ÷ (135+300) ×100% =

(2) Yintai Department Store 300 yuan presented 145 yuan gift certificate, with a preferential margin of [150 ÷ (150+300) ×100% = 33.33%].

(3) Xie Bai: 300 yuan reduced 100 yuan, with a preferential margin of 33.33% (100 ÷ 300×100% = 33.33%).

(4) A 15% discount on the sales of Hangzhou Mansion means a 15% discount, (1-75%=25%).

3. A middle school organizes a spring outing for junior one students. It was originally planned to rent a number of 45-seat buses, but 15 people had no seats. If you rent the same number of 60 buses, there will be one more bus, and the remaining buses will be full. It is understood that the daily rent for 45 buses is 220 yuan per bus, and the daily rent for 60 buses is 300 yuan per bus. How much did the first-year students say? How many 45-seat buses were originally planned to be rented? (2) How to rent a car is more cost-effective so that every student has a seat?