High interest rates make it difficult for people to pay off credit card debt in a reasonable period of time. The interest I (in dollars) paid on a $10,000 debt over 3 years when the interest rate is r% can be approximated by the equation shown below. I 175.393 + 0.663 = r If the credit card interest rate is 18%, find the amount of interest paid during the 3 years. I = $