How do you prepare the following adjusting, reversing and next period entry into an unadjusted trial balance?

Question

I also need help with the rest of this problem. Cost of supplies still available December 31 is 2,700
The notes payable requires an interest payment to be made every 3 months. The amount of unrecorded accrued interest at Dec 31 is 1,250. The next interest payment at an amount of 1,500, is due on January 15.