A trader owes the following debts

3000 riyals is due for payment after 50 days

4500 riyals due for payment after 60 days

5000 riyals is due for payment after 72 days

Agree with his creditor to settle his debts now as follows:

1- He pays an amount in cash of 5520

2- The rest is issued to him a promissory note, which will be payable after 120 days from now

If I know, the settlement was made at a rate of 12% annually, what is the nominal value of the promissory note?