Ruth lewis has adjusted gross income of $100,000 for 2019 and itemizes her deductions. on september 1, 2019, she made a contribution to a private nonoperating foundation (not a 50% charity) of stock held for investment for 2 years that cost $25,000 and had a fair market value of $70,000. the foundation sold the stock for $70,000 on the same date. assume that lewis made no other contributions during 2019. how much should lewis claim as a charitable contribution deduction for 2019?