During February 2010, its first month of operations, the owner of Schwenn Enterprises invested cash of $25,000. Schwenn had cash sales of $4,000 and paid expenses of $7,000. Assuming no other transactions impacted the cash account, what is the balance in Cash at February 28?
a) $3,000 credit
b) $22,000 debit
c) $29,000 debit
d) $18,000 credit