linear programming, Mathematics

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Chelsea has been facing some financial problems which even caused her daily expenses for food, at the same time, she hasn''t receive the money from the bank loan yet. Therefore, she has designed and made the decision to work for 2 part time jobs in order to solve certain problems.
Chelsea earns $3 per hour working part time job at cafe in campus, by making wafer and $1 per hour in cyber cafe. If she has only 26 hours per week to work and she must earn at least $100 during that period, how many hours can she spend at each job in order to earn at least $100?

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