On January 10 Donna Stark purchases merchandise from Baver Co. for $2,100 but does not pay in cash. On February 10, she is billed for the amount due of $2,100. On February 12 Stark pays $1,600 on the balance due. On March 10 Stark is billed for the amount due, including interest at 1% per month on the unpaid balance as of February 12.

Prepare the entries on Baver Co.s books related to the transactions that occurred on January 10, February 12, and March 10.