NO.PZ2016082406000018
问题如下：
If the default probability for an A-rated company over a three-year period is 0.3%, the most likely probability of default for this company over a six-year period is:
选项：
A.
0.30%
B.
Between 0.30% and 0.60%
C.
0.60%
D.
Greater than 0.60%
解释：
ANSWER: D
The marginal default rate increases with maturity. So, this could be, for example, 0.50% over the last three years of the six-year period. This gives a cumulative default probability greater than 0.60%.
你好，请问这里的0.6%怎么来的呢
