Answer:
approximate YTM = 7.48%
Step-by-step explanation:
the approximate yield to maturity = {coupon + [(face value - market value)/n]} / [(face value + market value)/2]
approximate YTM = {$80 + [($1,000 - $1,050)/15]} / [($1,000 + $1,050)/2]
approximate YTM = ($80 - $3.33) / $1,025
approximate YTM = $76.67 / $1,025
approximate YTM = 0.0748 ≈ 7.48%