A picnic invites two kinds of charges: bus fare, which is independent of the number of people attending the picnic and buffet lunch, which increases directly with an increase in the number of people. The charges are calculated to be Rs. 165 per head when there are 200 invitees and Rs. 170 per head when there are 150 invitees. What would be the charges per head when there are 100 invitees?

• let d bus charge is c.and d is the buffet charge.so let x is the number of pepole.so d is proportional to x.so let d=x*const;so total expense for 200 pepole=c+200*const=200*165.for 150 pepole total expense=c+150*const=150*170.find c and const.and calculate for 100 pepole. i find 180rupees.
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• 180 per head
  
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