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Julia Robertson faces a challenge of knowing the probable number of units she should sell before making a profit of $1000. She is planning to sell one piece of hot dog and pizza for $1.50 while, she is looking to vend barbecue sandwich for $2.25 and her total budget is $1500. The pizza, hotdog and sandwich will cost her $0.75, $0.45 and $0.90 respectively. Following is the tentative linear model that will be applied in order to determine the number of units of each merchandise type that should be sold to make 1000 bucks in each game.