Answer:
the worse case scenario is that the bond yields -2.73%
Step-by-step explanation:
the worst case scenario is that the bonds are called one year after they are issued.
you invest $110 today
in one year, you will receive $100 + $7 = $107
your holding period return = ($107 - $110) / $110 = -0.02727 ≈ -2.73%
generally callable bonds are sold at lower prices than regular bonds, so a situation like this is very unlikely since the issue price should probably be lower.