Ben is 18 years old. He decided to start investing $180 every month into an average mutual fund (interest rate 12%). How much money will he have when he's 58 years old?

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.