Formal:
* 我很好,谢谢。您呢? (wǒ hěn hǎo, xièxie. nín ne?)
* This is the most polite and formal way to say it. It's appropriate for situations with elders or strangers.
* "您" (nín) is the formal "you."
Informal:
* 我很好,谢谢。你呢? (wǒ hěn hǎo, xièxie. nǐ ne?)
* This is a casual and friendly way to say it, suitable for friends and family.
* "你" (nǐ) is the informal "you."
Other options:
* 我没事,谢谢。您呢? (wǒ méi shì, xièxie. nín ne?) - "I'm fine, thank you. And you?"
* 我挺好的,谢谢。您呢? (wǒ tǐng hǎo de, xièxie. nín ne?) - "I'm doing well, thank you. And you?"
Important Note: In Chinese, it's common to repeat the question "And how about you?" at the end of a greeting to show you're interested in the other person's well-being.