Answer:
13
Step-by-step explanation:
Modified duration of stock = (1 + Growth rate) / (Effective rate - Growth rate)
Modified duration of stock = (1 + 4%) / (12% - 4%)
Modified duration of stock = (1 + 0.04) / 0.08
Modified duration of stock = 1.04 / 0.08
Modified duration of stock = 13
So, the modified duration of this share of the stock is 13.