Sain Advertising Ltd.’s opening trial balance on January 1 shows Supplies $1,500. On January 11, the company purchased additional supplies for $1,800 on account. On January 31, there are $1,100 of supplies on hand.

a. Prepare the journal entry to record the purchase of supplies on January 11.

b. Calculate the amount of supplies used during the month.

c. Prepare the adjusting entry required at January 31, assuming adjusting entries are prepared monthly.

d. Using T accounts, enter the opening balances in the affected accounts, post the journal entries in parts (a) and (c), and indicate the adjusted balance in each account.