You have just put $600 on your credit card. You can pay back 50 dollars each month and the interest is 12% a year. How long does it take when you pay off your balance?

How long does it take, approximately, when the interest generated by principal equals the interest generated by interest for a particular year (i.e., it refers to the interest generated by interest for a particular year, not the interest generated by interest that has cumulated so far), when the interest rate = 9%

Which of the following bond has the lowest interest rate risk?

		10-year, coupon rate=10%, semiannual coupon payment.
		10-year, coupon rate=5%, semiannual coupon payment.
		20-year, coupon rate=5%, monthly coupon payment.
		30-year, coupon rate=2%, quarterly coupon payment.