Helga had AGI of $135,000 in 2018. She donated corporate stock with a basis of $28,000 to a qualified charitable organization on April 3, 2018.

a.  What is the amount of Helga's deduction assuming that she purchased the stock on June 15, 2017, and the stock had a fair market value of $26,000 when she made the donation?

Helga's deduction is $.

b.  Assuming that she purchased the stock on January 15, 2017, and the stock had a fair market value of $33,000 when she made the donation, Helga's deduction is $

c.  Assuming that she purchased the stock on January 15, 2018, and the stock had a fair market value of $29,000 when she made the donation to the charity, Helga's deduction is $