Juan trabaja como vendedor le dan de comisión $100 por cada $100 que vende en caso de que no complemente los 100 recibe solamente la parte proporcional​

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint

the cover letter for a job search includes the skills one has for the particular job. including a cover letter is always a good idea, as it describes the ability to perform a task, and the employer can easily fetch the intention of the job you want to do.  

the cover letter is very important to be included in the job search document. hence, i strongly with the statement.