At a school, 40% of the students receive a free lunch. These lunches are paid for by making sure the price paid by the paying students is enough to cover everyone's meal. If it costs $210 to feed 50 students, how much do the paying students pay for lunch?
60% of the students pay for the lunch because 100 - 40 = <<100-40=60>>60
30 students pay for lunch because 50 x .6 = <<50*.6=30>>30
These students pay $7 for their lunch because 210 / 30 =<<210/30=7>>7
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