some property investment maths questions?

Assume you invest 00 in Government Bonds that are trading at par value. What yield does a dividend of 0 represent?
a)5.00%
b)5.78%
c)0.50%
d)6.30%

You have 300 .20 units in a Listed Property Trust. The trust has suspended all distributions, what is the current yield on your units?
a)0.00%
b)2.67%
c)6.54%
d)3.70%

You purchase 600 shares in an industrial company trading below par. The shares are paying a dividend of {content}.90. What is the yield?
a)20.00%
b)15.00%
c)18.00%
d)22.50%