[Haskell-beginners] Help with improving a program

[Marcelo Lacerda]

Hi I'm just starting with haskell and want some help with it.

I tried to solve the Store Credit[1] problem from google code jam just
to practice, the result was a slow code[2] that I find hard to read.

Can you guys give me some directions on how to improve it?

[1] - https://code.google.com/codejam/contest/351101/dashboard#s=p0
[2] - http://pastebin.com/jNGxGP5H

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