USAco, a domestic corporation, is the wholly-owned U.S. subsidiary of FORco, a foreign corporation. The U.S.-Country F tax treaty exempts interest payments from withholding taxes. USAco's fi nancial statements appear as follows:
BALANCE SHEET
Assets Liabilities & Owners' Equity
Cash $100
Receivables $500
Notes Payable $400
Owner's Equity $200

INCOME STATEMENT
Gross Income $500
Administrative Expenses $350
Interest Expense $100

The interest expense of $100 arises from a notes payable from USAco to FORco.

What is the maximum amount of interest USAco may deduct on its U.S. return?