On April 3, 2011, Luis filed his 2010 income tax return, which showed a tax due of

Question:

On April 3, 2011, Luis filed his 2010 income tax return, which showed a tax due of $75,000. On June 1, 2013, he filed an amended return for 2010 that showed an additional tax of $10,000. Luis paid the additional amount. On May 18, 2014, Luis filed a claim for a 2010 refund of $25,000.
a. If Luis's claim for a refund is correct in amount, how much tax will he recover?
b. What is the period that government-paid interest runs with respect to Luis's claim for a refund?
c. How would you have advised him differently?