A summary of selected ledger accounts appears below for Alberto's Plumbing Services for the current calendar year-end. Alberto, Capital 12/31 8,500 1/1 6,500 12/31 15,000 Alberto, Drawing 6/30 3,500 12/31 8,500 11/30 5,000 Net income for the period is a.$15,000 b.$18,500 c.$33,500 d.$13,000