if a certan computer is capable of printing 4900 monthly

• Question: If a certain computer is capable of printing 3900 monthly credit card bills per hour, while a new model is capable of printing at a rate of 6300 per hour, the old model will take approximately how much longer than the new model to print 10300 bills?
  
  a) 97
  b) 258
  c) 60
  d) 106
  e) 14
  Solution: the old computer will print 10300 bills in 10300/3900 hours = 103/39
  the new computer will print 10300 bills in 6300/10300 hours = 103/63
  the time difference is 103/39 - 103/63 = (6489 - 4017) / 39*63 = 2472/2457 = 1 hour = 60 minutes
  
  the answer is c) 60
  
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• a certain computer is capable of printing 4900 monthly credit card bills per hour, while a new model is capable of printing at a rate of 6600 per hour, the old model will take approximately how much longer than the new model to print 10000 bills?
  Answer: 31 minutes
  Explanation:
  Old model is capable of printing at a rate of 4900 per hour
  New model is capable of printing at a rate of 6600 per hour
  Old model time taken to print 10000 cards = 10000/4900 = 100/49
  New model time taken to print 10000 cards = 10000/6600 = 100/66
  Old model – new model: 100/49 - 100/66 = 1700 /(49 × 66) = 850/(49 × 33) = 0.525 hrs => 31 mins
  Therefore, the old model will take approximately 31 mins longer than the new model to print 10000 bills
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