how did they get N=12 and pmt=50 and i=4

Example: When the firm was first created four years ago it issued 100,000 shares at $20 per share. The book value of equity is $2,000,000. The shares currently sell for $40 per share. The market value of the equity is the value of the shares at current prices, in other words $4,000,000. The firm also borrowed $10,000,000 at 10%. The 10-year bonds had a face value of $1,000 and paid coupons semi-annually. It is now four years later and interest rates on this kind of bond have gone down to 8%. We can find the bond price using (n = 12, pmt= 50, fv = 1,000, i = 4) so the pv = 1,094. Since there are 10,000 bonds outstanding and each bond sells for $1,094, the total market value of debt is $10,940,000