; or (B) 10 percent of the sum of the annual revenues of the eligible entity and all affiliate businesses of the eligible entity for the calendar year preceding the award of the grant. (2) Determination of grant amount (A) In general The amount of a grant made to an eligible entity under this section shall be based on the difference in revenues or estimated revenues of the eligible entity during a calendar quarter in 2020 selected by the eligible entity as compared to 95 percent of the revenues of the eligible entity in the same calendar quarter in 2019. (B) Verification An eligible entity shall submit to the Secretary such revenue verification documentation as the Secretary may require to determine the amount of a grant under subparagraph (A). (C) Repayment Any amount of a grant made under this section to an eligible entity based on estimated revenues in a calendar quarter in 2020 that is above the actual revenues of the eligible entity during that calendar quarter shall be converted to a loan that has— (i) an interest rate of 1 percent; and (ii) a maturity date of 10 years beginning on January 1, 2021. (3) No duplication of benefits An eligible entity that received a loan under section 7(a)(36) of the Small Business Act ( 15 U.S.C. 636(a)(36) ) may not apply for or use grant amounts under this section for the same expenses for which the eligible entity received the loan. (4) Limitation An eligible entity may not receive more than 1 grant under this section. (e) Use of funds (1) Allowable uses During the covered period, an eligible entity that receives a grant under this section may use the grant funds for— (A) payroll costs; (B) payments of principal or interest on any mortgage obligation; (C) rent payments, including rent under a lease agreement; (D) utilities; (E) maintenance expenses, including construction or reconfiguration to accommodate social distancing requirements; (F) supplies, including protective equipment and cleaning materials