If John, Susan, Greg, and Smith have capital balances at the beginning of the year totaling $20,000, $20,000, $30,000, and $30,000, respectively, what is Susan's end-of-year capital balance if she withdrawals $15,000 during the year and is allocated her share of income based upon her capital balance at the beginning of the year after John, Susan, Greg, and Smith are allocated $2,000 in salaries each per their partnership agreement when the year's income is $30,000?