Can someone please give a visual where did the $19,608,310 come from and how did they get .04 as the decimal. thank you

A company issues $20,000,000, 7.8%, 20-year bonds to yield 8% on January 1, 2010. Interest is paid on June 30 and December 31. The proceeds from the bonds are $19,604,145. Using effective-interest amortization, how much interest expense will be recognized in 2010? $1,568,498 ($19,604,145 x 04) ($19,608,310 x .04) E $1,568,498