; or (B) the useful life of any physical asset to be financed by the loan (as determined by the Corporation). (3) The Corporation shall, with respect to providing any loan guaranty to a project, require the parties to the loan guaranteed by the Corporation to bear the risk of loss for at least 20 percent of the guaranteed support by the Corporation in the project. (4) The Corporation may not guarantee a loan unless the Corporation determines that the lender is responsible and that adequate provision is made for servicing the loan on reasonable terms and protecting the financial interest of the United States. (5) The interest rate for direct loans and interest supplements on guaranteed loans shall be set by reference to a benchmark interest rate (yield) on marketable Treasury securities or other widely recognized benchmarks with a similar maturity to the loans being made or guaranteed. The Corporation shall establish appropriate minimum interest rates for loans, guarantees, insurance, and other instruments as necessary. (6) The minimum interest rate for new loans as established by the Corporation shall be adjusted periodically to take account of changes in the interest rate of the benchmark financial instrument. (7) (A) The Corporation shall set fees or premiums for loan guarantee or insurance coverage at levels that minimize the cost to the Government (as defined in section 502 of the Federal Credit Reform Act of 1990 ( 2 U.S.C. 661a )) of such coverage, while supporting achievement of the objectives of the loan. (B) The Corporation shall set the minimum guarantee fee or insurance premium at a level sufficient to cover the Corporation’s costs for paying all of the estimated costs to the Government of the expected default claims and other obligations. (C) The Corporation shall review fees for loan guaranties periodically to ensure that the fees assessed on new loan guarantees are at a level sufficient to cover the Corporation’s most recent estimates of its costs. (8) Any loan guaranty provided by the Corporation