问题如下：
Avocado Bank calculates market risk capital through an internal model approach to meet the requirements of the 1996 Amendment to the Basel Accord. They found 8 exceptions when backtesting the 99%,one-day var against the actual losses over the last 250 trading days. Based on the number of expctions, which of the following multiplicative factor should be seted ?
选项：
A. between 2.1 and 2.9.
B. 3.
C. 4.
D. between 3.1 and 3.9.
解释：
D is correct.
考点：multiplicative factor
解析：Avocado Bank 需要将它计算出来的250个交易日中99%的one-day VaR与同一时期的实际损失进行比较，以确定multiplicative factor。 如果实际损失大于估计损失，记录一次例外。
例外次数对应的multiplicative factor如下：
小于5时，multiplicative factor为3，
5到9次的例外对应3.1到3.9这个区间（五个数字分别对应3.4,3.5,3.65,3.75和3.85）
大于等于10次的例外系数为4。
这里是1天应为10天，怎么换算