You're really good at investing and you have $1,500 in your investment account. you make 8.5% interest a year on your investment account! for a year you owe $1,600 on a credit card. you pay 19% interest a year on this credit card debt. how much money are you making on your investment in a year? $ how much money are you paying in interest in a year on your card? $ what's your total gain/loss that year? $ enter a negative value for a loss.