McDonald’s posted better-than-expected sales in the first quarter but said high gas prices and consumer anxiety over the Iran war could dent sales this spring.The average price of a gallon of gas in the U.S. was $4.55 on Thursday, according to AAA. That was 44% higher than a year ago.McDonald’s Chairman and CEO Chris Kempczinski said the company has been making progress bringing lower-income custo…

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