Today my 12-year-old son asked me how much daddy makes. How do I have this convo with him? How much do I disclose?

My 7 year old daughter asks me the exact same question a few days ago after she came back from school. She apparently was preparing for a presentation about what their parents do for a living so she was "interviewing me". When she asked me how much was I making, my answer was simply because she wouldn't understand the depth of monies yet. I said, I earn enough to buy everything that she needed, and her toys and her brother's needs. And she understood it. Since she was only 7, she wouldn't the concept of quality yet so I felt that was the best way to answer her. To her $2 makes her rich