Bob orders a dozen muffins a day for $0.75 each and sells them for $1.5 each.  How much profit does he make a week?
He buys them for 12*.75=$<<12*.75=9>>9
He sells them for 12*1.5=$<<12*1.5=18>>18
So he makes 18-9=$<<18-9=9>>9 per day
That means he makes 9*7=$<<9*7=63>>63 per week
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