10. (4 points) Every week, Sarah is paid $30 per hour for the first 30 hours she works, and $60 per hour for each hour
10. (4 points) Every week, Sarah is paid $30 per hour for the first 30 hours she works, and $60 per hour for each hour she works after the first 30 hours. How many hours would Sarah have to work in one week to earn an average (arithmetic mean) of $50 per hour that week
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