Cost of debt using both methods(YTM and the approximationformula)

Currently, Warren Industries can sell 15-year, $1,000 par-value bonds paying annual interest at a 9% coupon rate. As a result of current interest rates, the bonds can be sold for $1070 each before incurring flotation costs of $20per bond. The firm is in the 40% tax bracket.

Solve please (hoe did you get the PMT??