The decedent’s note was silent on how interest was to be calculated, and the court would not consider extrinsic evidence in the form of amortization schedules, so the interest on the unpaid principal was to be calculated as simple interest and not compound interest, resulting in a debt of $63,174.30 and not $1,318,488.22. Dembosky Estate, 1 Fid.Rep.4th 267 (Lackawanna O.C. 2022), aff’d, 571 MDA 2022 (Pa. Super. 6/15/2023) (non-precedential).