②2×6+2×4=20, you can rent two big houses and two small houses.
Answer: ① You can rent five small houses; You can rent two big houses and two small houses.
(2)①6×5=30 (yuan)
②8×2+6×2
= 16+ 12
=28 (yuan)
30 yuan > 28 yuan, so rent two big houses and two small houses.
A: Rent two big houses and two small houses to save money.