Mary, Jane, Tom, Andy saved for 6 weeks like this:
 -
 M: 2, 4, 8, 16,
 J: 10, 12, 14, 16,
 T: 7, 13, 19, 25,
 A:
 3,6,9..
 Work out how much each person saved so that you can put their names in
 order of how much they saved, from smallest to largest amount.
 Enter your code as a four-lettered "word"