Answer:
approximate YTM = 12.16%.
Explanation:
the approximate yield to maturity = {coupon + [(face value - market value) / n]} / [(face value + market value) / 2]
approximate yield to maturity = {100 + [(1,000 - 850) / 12]} / [(1,000 + 850) / 2] = 112.5 / 925 = 0.1216 = 12.16%
An investor that purchases this bond at $850 can expect to earn a 12.16% return.