问题如下：
WL Corporation is located in a jurisdiction that has a 40 percent corporate tax rate on pretax income and a 30 percent personal tax rate on dividends. WL distributes all its after-tax income to shareholders. What is the effective tax rate on WL pretax income distributed in dividends?
选项：
A. 42 percent.
B. 58 percent.
C. 70 percent.
解释：
B is correct.
The effective tax rate can be computed as 1 minus the fraction of 1 unit of earnings that investors retain after all taxes, or 1 – (1 – 0.40)(1 – 0.30) = 0.58 or 58 percent effective tax rate. Another way to obtain the solution: Corporate taxes = 1.00 × 0.40 = 0.40 and Personal taxes = 0.60 in dividends × 0.30 = 0.18, so Total tax = 0.40 + 0.18 = 0.58, a 58 percent effective rate.
0.6 Div怎么来的，题目中好像没有啊？
