Roland Foster Optical Dispensary completed the following transactions during the latter part of March: Mar. 15 28 Purchased office supplies on account, $3,400. Paid $1,800 on account. Requirements 1. Journalize the transactions of Roland Foster Optical Dispensary. Include an explanation with each journal entry. 2. Open the following accounts (use T-account format): Cash (Beginning Balance of $21,000), Office Supplies, and Accounts Pavable. Post the journal entries from Requirement to the accounts, and compute the balance in each account