I want to know why the interest income is wrong(Notes receivable*0.07)?

Sullivan Equipment Sales showed the following. 2020 Jan. 15 Sold $25, 450 of merchandise for $29, 900 to JanCo; terms 3/5, n/15. 16 Wrote off Fedun' s account in the amount of $15, 450. 20 Mar. 1 Collected the amount owing from the January 15 sale. Accepted a $12, 180, 60-day, 7% note dated this day in granting Parker Holdings a time extension on its past due account. Sold merchandise costing $62, 450 for $71, 900 to customers who used their Visa credit cards. Visa charges a 1% fee and deposits the cash electronically into the retailer' s account immediately at the time of sale. Parker Holdings honoured the note dated March 1. Apr. 15 ? Nov. 1 Accepted a $24, 900, three-month, 6% note dated this day in granting Grant Company a time extension on its past-due account Sullivan's year-end. Interest was accrued on outstanding notes receivable. Dec. 31 31 Bad debts are based on an aging analysis that estimated $9, 700 of accounts receivable are uncollectible. Allowance for Doubtful Accounts showed an unadjusted credit balance of $1,645 on this date. 2021 ? Grant Company dishonoured its note dated November 1, 2020. Mar. 5 Recovered $1,500 from Derek Holston that was previously written off. 14 Wrote off the Grant Company account. Required: a. Determine the maturity dates of the March 1 and November 1 notes. Answer is complete and correct. Date of Note March 1 Maturity Date April 30, 2020 February 1, 2021 November 1 8 8 h. Cash 13,032.60 x Notes receivable - Parker Holdings Interest income 12,180.00 852.60 X