Answer: 30 days
Step-by-step explanation:
The accrued interest is to be paid for the period beginning from the date of issue till the date of settlement. However, the date of settlement is not included which means interest will not be paid for the 1st of February.
That leave the 31 days of January for payment. With Municipal Bonds however, accrued interest is calculated assuming only 30 days in a month so January will have 30 days in terms of accrued interest.
30 days is the number of days that accrued interest must be paid to the underwriter.