the total expense of boarding house are partly fixed and partly variable.the charge is rs 70 per head when there are 25 boarders and rs 60 when there are 50 boarders.find charge per head when there are 100 boarders

2 Answers on this Question

1. 55

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2. x+25y=70*25=1750
   x+50y=60*50=3000
   solve the both
   25y=1250
   y=50
   x=500
   500+100*50=>5500/100=55
   ans is 55

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