LKD Co. has 13 percent coupon bonds with a YTM of 8.8 percent. The current yield on these bonds is 9.2 percent. How many years do these bonds have left until they mature?

Reading the notes from here http://finance.thinkanddone.com/

At first we find the price = $1,413.04

Now we find the remaining years to maturity = 23.78

LKD Co. has 13 percent coupon bonds with a YTM of 8.8 percent. The current yield on these bonds is 9.2 percent. How many years do these bonds have left until they mature?