during the month, you received a salary of $3,000, charged a $40 meal to your credit card, paid back $500 of money owed to your parents, paid $30 in

during the month, you received a salary of $3,000, charged a $40 meal to your credit card, paid back $500 of money owed to your parents, paid $30 in interest charges and prepaid $300 for a magazine subscription. during the month, your net worth:

increase or decrease, and by how much