Jay Pembroke started a business. During the first month (April 20--), the following transactions occurred. Invested cash in business, $18,000. Bought office supplies for $4,600: $2,000 in cash and $2,600 on account. Paid one-year insurance premium, $1,200. Earned revenues totaling $3,300: $1,300 in cash and $2,000 on account. Paid cash on account to the company that supplied the office supplies in transaction (b), $2,300. Paid office rent for the month, $750. Withdrew cash for personal use, $100. Required: