a. Collected $2,100 rent for the period October 1 to December 31, which was credited to Unearned Revenue on October 1. a. Collected $2,100 rent for the period October 1 to December 31, which was credited to Unearned Revenue on October 1. b. Paid $960 for a two-year insurance premium on October 1 and debited Prepaid Insurance for that amount c. Used a machine purchased on October 1 for $36,000. The company estimates annual depreciation of $3,600. a. Collected $2,100 rent for the period October 1 to December 31, which was credited to Unearned Revenue on October 1. a. Collected $2,100 rent for the period October 1 to December 31, which was credited to Unearned Revenue on October 1. b. Paid $960 for a two-year insurance premium on October 1 and debited Prepaid Insurance for that amount c. Used a machine purchased on October 1 for $36,000. The company estimates annual depreciation of $3,600