Could some one help me on this problem please:

Net Operating Loss Carrybacks and Carryovers. In 2009, Ace Corporation reports gross income of $200,000 (including $150,000 of profit from its operations and $50,000 in dividends from less-than-20%-owned domestic corporations) and $220,000 of operating expenses. Aces 2007 taxable income (all ordinary income) was $75,000, on which it paid taxes of $13,750.

a. What is Aces NOL for 2009?

b. What is the amount of Aces tax refund if Ace carries back the 2009 NOL to 2007?

c. Assume that Ace expects 2010s taxable income to be $400,000. Ignore the U.S. production activities deduction. What election could Ace make to increase the tax benefit from its NOL? What is the dollar amount of the expected benefit (if any)? Assume a 10% discount rate as a measure of the time value of money.