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

• 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
• 10 years agoHelpfull: Yes(20) No(3)
• (10300/3900)-(10300/6300)=(2163-1339)/819
  =824/819
  =1.00 hour takes more time than old printer
  =60 min .ans
• 10 years agoHelpfull: Yes(5) No(0)