Dr. Zaius invests $10,000 in a CD with an annual interest rate of 4% that compounds semi-annually (twice a year). After six months, he rolls over the CD into another CD with an annual interest rate of 5% that also compounds semi-annually. After six months in the second CD, how much does Dr. Zaius have, in dollars?
The first CD compounds at a rate of percent for the first six months, so Dr. Zaius has dollars. The second CD compounds at a rate of percent for the next six months, so Dr. Zaius then has dollars.