ONE QUESTION, ONE STEP
ZX-8CF090D653Linear inequalities in one or two variables · 第 15 题
Linear inequalities in one or two variables · 原库模块 1 · Q15 原库参考解析
Ken is working this summer as part of a crew on a farm. He earned $8 per hour for the first 10 hours he worked this week. Because of his performance, his crew leader raised his salary to $10 per hour for the rest of the week. Ken saves 90% of his earnings from each week. What is the least number of hours he must work the rest of the week to save at least $270 for the week?
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