Final answer:
Patrick can deduct the basis amount of the publicly traded stock, which is $20,000, for his donation to a private nonoperating foundation.
Step-by-step explanation:
The amount that Patrick can deduct for the stock donation to the private nonoperating foundation is limited. Under tax rules, when donating to such foundations, the deduction for donated appreciated property is usually limited to the donor's basis in the property rather than the fair market value. For publicly traded stock, this generally means that the donor can only deduct what they originally paid for the stock. Given that Patrick's basis in the publicly traded stock is $20,000, and since he’s donating to a private nonoperating foundation, $20,000 would be the deductible amount.