8.5+6.5+ 1.2= 16.2 (yuan).

A: Cost 16.2 yuan.

② because 5.6+3.3=8.9 yuan < 10 yuan,

4.5+3.3=7.8 yuan < 10 yuan,

5.6+ 1.2=6.8 yuan < 10 yuan,

4.5+ 1.2+3.3=9 (yuan) < 10 yuan,

6.5+ 1.2=7.7 yuan < 10 yuan.

A: 10 yuan can buy an earphone and a doll; Or dolls or toy lions; Or a windmill, a doll; Or toy lions, dolls; Or a small plane or windmill.