能不能翻译解释下这道题，不太懂

问题如下：

Question Which statement about OA’s three-year financial performance is most accurate? OA’s:

选项：

A.effective tax rate has been holding steady at approximately 2%. B.revenues per dollar of sales costs are falling over the time period. C.profit margins indicate performance superior to the industry average.

解释：

Solution

1. Incorrect because the effective tax rate did not average 2% over the period. In the case of taxes, it is more meaningful to compare the amount of taxes paid with the amount of pre-tax income, then examine the causes for any differences in effective tax rates. Although taxes as a percent of sales has held steady at roughly 2%, OA’s corporate tax rate exceeded 20% each year.

   Tax rate = Taxes/Earnings before taxes

   2013: 1.9%/8.1% = 23.5%

   2014: 2.0%/9.2% = 21.7%

   2015: 2.0%/9.9% = 20.2%

2. Correct. OA’s cost of sales have been steadily rising, causing the firm’s gross profit margin to fall below the industry average. A falling gross margin indicates falling revenue per dollar of sales costs.

3. Incorrect because OA’s industry-relative performance shows below-average gross margin results, in contrast to the net profit margin, which exceeds the industry average.

Analyzing Income Statements

• evaluate a company’s financial performance using common-size income statements and financial ratios based on the income statement