Grossnickle Corporation issued 20-year, noncallable, 7.5% annual coupon bonds at their par value of $1,000 one year ago. Today, the market interest rate on these bonds is 5.5%. What is the current price of the bonds, given that they now have 19 years to maturity?

The answer is $1,232.15, but I would like to know how to get to that answer without the use of Excel or a financial calculator. Thanks.