Answer:
The Journal entries are as follows:
(a) On April 1, 2021
Notes receivable A/c          Dr. $600,000
To Cash A/c                                                  $600,000
(To record loan given) 
(b) On December 31, 2021
Interest receivable ($600,000 × 11% × 9/12)  A/c     Dr. $49,500
To Interest revenue                                                                         $49,500
(To record accrued interest)
(c) On April 1, 2022
Cash A/c                    Dr. $666,000       
To Notes receivable                                     $600,000
To Interest receivable                                $49,500
To Interest revenue                                      $16,500  
(To record collection)
Notes:
Interest revenue on April 1, 2022: 
= 11% of loan amount for 12 months - Accrued interest
= 0.11 × $600,000 - $49,500
= $66,000 - $49,500
= $16,500