Answer:
a. The preparation of partial amortization is shown below:-
b. $2,892 
Explanation:
a. Date	Lease  Effective        Decrease in  Outstanding               
              payment     interest           balance          balance
July 1                                                                           $150,000
July 1     $5,376                                  $5,376             $144,624
                                                                                 ($150,000 - $5,376)
Oct 1      $5,376       $2,892              $2,484              $142,140
                                                        ( $5,376 - $2,892) ($144,624 - $2,484)
b. Interest expense on October 1 = $2,892 
Working Note:- 
Take the outstanding balance times 2% (8% annual = 2% quarterly) 
So, the Effective interest = $144,624 × 0.02
= $2,892.48