Section 45-13-04 - (104) Supplemental principles of law1. Unless displaced by particular provisions of chapters 45-13 through 45-21, the principles of law and equity supplement chapters 45-13 through 45-21.2. If an obligation to pay interest arises under chapters 45-13 through 45-21 and the rate is not specified, the rate is that specified in section 47-14-05.