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