A renting house has 100 chairs which it rents out for a charitable organization for free. However, for ensuring
that the chairs are returned in good condition, the renting house offered Rs 3 for every chair returned in good
condition and charged Rs 9 for every broken chair. At the end of the day, the charitable organization received
RS.240. How many chairs were returned broken?

• If x chairs are broken , then
  (100-x)*3 -9x= 240
  300-3x-9x=240
  12x =60
  x=5
  
  so 5 chairs are broken.
  
  or
  
  If 1 chair is broken , Rs 12 are lost.
  Here loss = 100*3-240=60
  so number of broken chairs = 60/12= 5
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