Invance Corp. began the month of April with a cash balance of $21,000. During April the company reported net income of $15,000. The following merchandise sales and purchases and cash receipts and cash payments occurred during April:
Purchased merchandise at a cost of $48,000 on credit
Sold merchandise with a cost of $36,000 on credit for $60,000
Made payments to creditors for merchandise purchases of $56,000
Collected $50,000 from credit customers
What is the balance of the cash account at April 30?
How do you get the answer 15,000?