To calculate how much money each person in the group won, we first need to determine the total amount of the prize that they won.
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Calculate 1/5 of the $4,500 prize: \[ \text{Total amount won} = \frac{1}{5} \times 4500 = 900 \]
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Next, we divide the total amount won by the number of people in the group (9 people): \[ \text{Amount per person} = \frac{900}{9} = 100 \]
Therefore, each person in the group won $100.