This document provides the solutions to calculating interest due at maturity for 5 notes. It states the formula used is interest due = Principal * rate * number of due days / 360. It then shows the calculations for notes with principal amounts of $103,460, $15,700, $30,850, $20,340, and $18,330 with various interest rates and time periods, rounding intermediate calculations to 4 decimals and the final answers to the nearest whole dollar.