Malcolm borrowed $550 from his parents to buy a used


computer. He did not have to pay them back for the first four


months, but starting on the fifth month, he began paying them


back at $50 per month until the loan was paid off.


Trish bought a $650 computer at the same time. She got a loan


from the computer store for the full amount of the loan. At the


beginning of every month, starting the month after she bought


the computer, she pays 10% of the remaining balance.


On what month, after the first two, will they owe


approximately the same amount?


Round your answer to the whole month if necessary.