Please show work and formulas:

Stone Sour Corp issued 20 year bonds two years ago at a coupon rate of 7.1 percent. The bonds make seminannual payments. If these bonds currently sell for 105 percent of par value, what is the YTM?

Settlement Date 1/1/2000

Maturity Date 1/1/2018

Annual coupon rate 7.10%

Coupons per year: 2

Face value (% of par) 100

Bond Price (% of par) 105