In how many months will money triple at 4% p.a. compounded monthly? State your answer in years and months (from 0 to 11 months). In year(s) and month(s) the money will triple at 4% p.a. compounded monthly. A promissory note for $800.00 dated January 15, 2017, requires an interest payment of $90.00 at maturity. If interest is at 12% p.a. compounded monthly, determine the due date of the note. ☐.0. The due date is (Round down to the nearest day.)