the cost of troubled assets and guarantees of troubled assets shall be calculated by adjusting the discount rate in section 502(5)(E) (2 U.S.C. 661a(5)(E)) for market risks; and

the cost of a modification of a troubled asset or guarantee of a troubled asset shall be the difference between the current estimate consistent with paragraph (1) under the terms of the troubled asset or guarantee of the troubled asset and the current estimate consistent with paragraph (1) under the terms of the troubled asset or guarantee of the troubled asset, as modified.