Time units
a)
We must recall 1 Millenium is equivalent to 1000 years
Thus, 20% of a Millenium is
20% of 1000 years
= 20 * 1000 / 100 = 200 years
b)
A century and a half.
Recall 1 century has 100 years
Thus, 1 century and a half is
100 years + 1/2 100 years
= 100 years + 50 years
= 150 years
Thus, the first option is more time than the second
Answer: 20% of a millenium