A: The original price of Computer Tips is 4.2 yuan.

② 2 1.6 divided by 6 = 3.6 (yuan)

4.2-3.6 = 0.6 (Yuan)

A: The computer prompts that 1 is cheaper than 0.6 yuan.

③25.2-2 1.6 = 3.6 (yuan)

3.6 divided by 1.3 is approximately equal to 2 (Ben)

She can buy two notebooks.

I hope my answer can help you, thank you.