The Powerball with Power Play ticket from the Saturday, July 17 drawing was sold at 7-Eleven on Bristol Pike in Croydon.
The ticket matched four of the five white balls drawn, 15-22-38-54-66, and the red Powerball 03 to win $100,000.
Without the $1 Power Play option, the ticket would have been worth $50,000.
The retailer will receive a $500 bonus for selling the winning ticket.
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