provided that the initial interest rate that would result from any such change under this paragraph (3), as determined on the effective date of the change or, if notice of the change is mailed or delivered to the borrower prior to the effective date, as of any date within 60 days before mailing or delivery of such notice, will not be an increase from the rate in effect on such date under the existing schedule or formula;
5 Del. C. § 2224