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Developments in the economic sector so far have brought quite a rapid impact in the business world, this has led to differences in sales at the market level. Porong Market is a traditional market located in Porong District, Sidoarjo Regency, East Java Province. Not all traders in Porong market have their own proper land or place to sell their wares. This creates problems when the rainfall is erratic and causes the traders' land to become flooded or muddy. This sales system is designed with the Java programming language which is then implemented on an Android-based system. The results of this study are the android based sales system using the firebase api which has been tested with blackbox testing on several respondents. The benefits of the research are expected to make it easier for the public to find out information about sales at the Porong market. And users can manage merchandise to keep getting a stable income for sellers
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