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Arrange these lunch buyers from greatest to least assuming they buy lunch 5 days per week: Alice spends $3 per day, Betty spends $25 every 2 weeks, and Cindy spends $75 per month.

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Alice spends $3 per day, so for in a week and upto 5 weeks, Alice spend =$3*5*5 = $75

Betty spends $ 25 every 2 weeks, so for 5 weeks , she spends= 25+25+12.5

= $62.5

Cindy spends $ 75 per month, and on an average there are less then 5 weeks in a month . SO for 5 week, it must be greater than $75 .

So the order is

Cindy>Alice>Betty