ratio of value added to sales

例句：

1. 1. The ratio of the population to the land area is 1:20.
   人口与土地面积的比例是1:20。
2. 2. The cost of living in this city is higher than the national average, with a ratio of 3:1.
   这个城市的生活费高于全国平均水平，比例为3:1。
3. 3. The company's profit margin is 25%, which is a good ratio for a business.
   公司的利润率为25%，对于企业来说这是一个不错的比例。