Mr. Henderson earns $800 per week. He spends $80 of what he earns on food for his family. What percentage of the money he earns is spent on food?

To find the percentage spent on food, divide the food cost by the weekly earnings: $80 ÷ $800 = 0.1. Convert 0.1 to a percentage by multiplying by 100, giving 10%. So Mr. Henderson spends 10% of his earnings on food, which is choice A.

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