Gain or Lose?

I like this question.

I would like to share it to you all.

Question:

A man bought a cat for RM 60 and sold it for RM 70.

Then he bought it back for RM 80 and sold it for RM 90.

How much did he make or lose in the cat trading business?

I shared my question.

Do you mind to share your answer with me?

Thanks~