Rachel used 9 cups of flour and 4 teaspoons of sugar.
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Using it's concept, it is found that the percentage of his sales that area food costs is of 29.62%.
<h3>What is a percentage?</h3>The percentage of an amount a over a total amount b is given by a multiplied by 100% and divided by b, that is:
In this problem, he has $1643 out of $5546 in food, hence the percentage is given by:
More can be learned about percentages at brainly.com/question/10491646
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