Answer :
If he made a sales of 12000 dollars in a week her earning will be 1160 dollars
How to find Evan earning from his sales?
He made a sales of 12000 dollars that week.
He earns 800 dollars per week plus 3% of sales.
Therefore,
3% of his sales = 3 / 100 × 12000 = 360 dollars
Therefore,
Her total earnings for that week = 800 + 360
Her total earnings for that week = 1160 dollars
learn more on sales here: https://brainly.com/question/15384480
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