; and (B) the costs associated with the installation or use of such cybersecurity technology and services. (2) Limitations on guarantee amounts The maximum amount of the principal of a loan guaranteed under this section may not exceed $50,000. The aggregate total amount of the principal of loans guaranteed under this section in a year may not exceed $500,000,000. (c) Fees With respect to each loan guaranteed under this section, the Administration shall assess, collect, and retain such fees as are necessary to reduce to zero the cost to the Administration of making guarantees under this section. As used in this subsection, the term cost has the meaning given that term in section 502 of the Federal Credit Reform Act of 1990 ( 2 U.S.C. 661a ). (d) Interest rates (1) Fixed rate loans With respect to a fixed rate loan guaranteed under this section, the interest rate for such a loan may not exceed— (A) for a loan in an amount greater than $25,000, the prime rate; and (B) for a loan in an amount less than or equal to $25,000, the prime rate plus 3.25 percent. (2) Variable rate loans (A) In general With respect to a variable rate loan guaranteed under this section, the interest rate for such a loan shall equal— (i) the prime rate plus the spread described under subparagraph (B)