Well as you point out, net income is 1% of sales. But part of your question is unclear. It's the child being paid $.50 to purchase $.25 of groceries or $25 of groceries. If its $25, then the child has made 2% of the amount of sales. I think you can do the math from there. Homework questions are given for you to do the work to show how much you have learned. We won't do that work for you, so you need to show you have at least attempted to do it.
As for asking questions here... It depends on the question.
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