If, after such application by the banking institution, or after the tax administrator's own review, the tax administrator determines that §§ 44-14-14.1 through 44-14-14.5 or subsection (f) of this section are not reasonably adapted to approximate the banking institution's net income derived from business carried on within the state, the tax administrator shall by reasonable methods determine the amount of net income derived from business activity carried on within the state. The amount thus determined shall be the net income taxable under §§ 44-14-3 or 44-14-4 and the foregoing determination shall be in lieu of the determination required by §§ 44-14-14.1 through 44-14-14.5 or subsection (f) of this section. If an alternative method is used by the tax administrator hereunder, the tax administrator, in their discretion, may require similar information from such banking institution if it shall appear that such alternative method or §§ 44-14-14.1 through 44-14-14.5 or subsection (f) of this section are not reasonably adapted to approximate for the applicable year the banking institution's net income derived from business carried on within the state and may again by reasonable methods determine such income.
R.I. Gen. Laws § 44-14-14.1