solve the word problems

At a recent party, it cost $9.50 for refreshments for 10 guests. At this rate, how much would it cost to have refreshments for 80 guests?

Mary has saved $17.50 in the past 3 weeks. At this rate, how much will she save in 15 weeks?

Mr. Johnson was paid $190 for a job that required 40 hours of work. At this rate, how much should he be paid for a job requiring 60 hours of work?

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