I dont know how to do parts a and b

The accounts feceivable derk for Kirchhoff Industries prepared the following partially completed aging of receivables schedule as of the end of business on Auguist 312 we ronowang accounts were unintentionally omitted from the aging schedule and not included in the preceding subtotals: 9. Determine the nunber of dars pait due tor rach of the sreceding accoints ar of Aygus a1. If an accourt is not pust due, mater ob. b. Complete the aging of recevables schedule by adding the cmitted accounts to the bottom of the schedule and updating the totals. If an amount box does not require an entry, le.me it blank