Answer:
4. At least 2.75%, but less than 3.25%
Explanation:
missing options:
i⁽²⁾ = approximate YTM = {2 + [(100 - 117.50)/50]} / [(100 + 117.50)/2] = 1.65 / 108.75 = 1.517% x 2, annual rate = 3.03%
i⁽²⁾ = approximate YTM = {2.50 + [(100 - 135)/50]} / [(100 + 135)/2] = 1.80 / 117.50 = 1.532% x 2, annual rate = 3.06%
Since both YTMs are very similar, we can determine that i⁽²⁾ is approximately 3%, maybe a little less or a little more, since we are using the approximate yield to maturity formula.