; and (4) treated in the same manner as provided under section 1316(f) of the Federal Housing Enterprises Financial Safety and Soundness Act of 1992( 12 U.S.C. 4516(f) ) with respect to amounts received by the Director from assessments under section 1316 of such Act, except that amounts from assessments under this section may be used only for expenses of the Director and the Agency relating to the functions and responsibilities under this subtitle. 216. Mutual Mortgage Insurance Fund capital reserve (a) Segregation of books To ensure accurate determinations of the capital ratio under subsection (b) of this section and such ratio under section 205(f) of the National Housing Act, as amended by subsection (d) of this section, the FHA shall establish separate accounts in the Mutual Mortgage Insurance Fund and take such other actions as may be necessary to segregate the following amounts: (1) Capital attributable to new business. (2) Capital attributable to mortgages that become insured before the expiration of the transition period under section 551. (b) Capital ratio for new business The FHA shall ensure that the account for the Mutual Mortgage Insurance Fund that is established pursuant to subsection (a)(1) of this section at all times maintains a capital ratio of not less than 4.0 percent. (c) Definitions For purposes of this section, the following definitions shall apply: (1) Capital The term capital means the economic net worth of the account of the Fund that is established pursuant to subsection (a)(1) of this section, as determined by the FHA under the annual audit required under section 538 of the National Housing Act ( 12 U.S.C. 1735f–16 ). (2) Capital ratio The term capital ratio means the ratio of capital to unamortized insurance-in-force. (3) Economic net worth The term economic net worth means the current cash available to the account of the Fund that is established pursuant to subsection (a)(1) of this section, plus the net present value of all future cash inflows and outflows expected to result from