Finance - Bonds

I am struggling in calculating bonds.  Below is the requirements:

Assume interest rates for bonds today is 5% for an AAA rated bond. Calculate the price of the bond you have selected relative to the 5%. Is the bond selling at a premium or a discount? Why? Be sure to show how you arrived at your answer.  What other factors may influence the value of a bond? 

Here is what I have done so far:

Assume interest rates for bonds today is 5% for an AAA rated bond. Calculate the price of the bond you have selected relative to the 5%.

I selected the bond Goldman Sachs Group Inc., Non-callable, Semi-Annual coupon frequency payment

Price: 101.02 

Coupon: 5.125%

Yield to Maturity = -3.694% 

Current Yield: 5.073

 The semi-annual coupon rate is 2.5625 (5.125 / 2%).  The assumed interest rate of 5% is displayed as .25 (5% / 2%).  This is a 10 year bond so the number of periods is 20 since this is paid semi-annually (10 * 2).

 PVo = ( coupon) (1 – [1/ (1 + r)ᵐ] )     + ( par value )

                              R                                  (1 + r)ᵐ 

PVo = (2.56) (1 – [1/(1 + .025)²⁰])  +  (1,000)

                              .025                  (1 + .025)²⁰

PVo = (2.56) (1-[1/(1.025)²⁰])  +  (1,000)

                      .025                           (1.025)²⁰

Here is the information on the bond: