For each of the following independent situations, prepare journal entries for the initial transactions that occurred in June and the adjustment required on July 31. a) On June 20, Magnificent Magazines received $12,000 for subscription services related to magazines that will be published and distributed in July through December. b) On June 30, Walker Window Washing paid $1,200 for supplies. As of July 31, $200 of these supplies had been used. c) Firepit Place paid $8,400 on June 25, to rent a storage unit for 12 months beginning July 1.