For a recent fiscal year, Circuit Citys quarterly balances of cash and cash equivalents were as follows:

Question:

For a recent fiscal year, Circuit City’s quarterly balances of cash and cash equivalents were as follows:
End of February ........ $885 million
End of May ......... $1,176 million
End of August ........ $847 million
End of November ......... $438 million
What would you expect would be the cause of the variation in Circuit City’s balances of cash and cash equivalents?