Calculate missing value for the promissory note: 
Definitions:
Days' Sales Uncollected
A financial metric measuring the average number of days it takes for a company to collect its receivables post-sale.
December 31
The last day of the calendar year, often used as the end date for annual financial reporting.
Balance Sheet
A financial statement that summarizes a company's assets, liabilities, and shareholders' equity at a specific point in time, showing the net worth and financial health of the business.
Cash Register
A machine or device at a point of sale used to calculate and register transactions and to store money.
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