“Sata ma cho?” is Gujarati/Jain way of asking “Are you in peace/well-being?”

A good reply is:

“Sata ma chhu.” Meaning: “I am in peace / I am well.”

You can also say:

“Jai Jinendra, sata ma chhu. Tame sata ma cho?” Meaning: “Jai Jinendra, I am well. Are you well?”