Even east Africas primacy in the worlds elite marathons suffered a blow when it was revealed last year that Kenyan Rita Jeptoo, winner of the Boston and Chicago marathons, had tested positive for EPO, which increases the production of oxygen-carrying red blood cells
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Continuous outcomes were analyzed using ANCOVA, with randomized treatment as a factor and baseline body weight as a covariate, while categorical data were analyzed with binary logistic regression
Pairs sold Revenues, 15,000 $40 Total cost of shoes, 15,000 $29 Total sales commissions, 15,000 $2 Total variable costs Contribution margin Fixed costs Operating income (loss) $760,000 15,000 $600,000 435,000 30,000 465,000 135,000 171,000 $ (36,000) 3