The heating value depends on the source of gas that is used and the process that is used to liquefy the gas. The range of heating value can span +/- 10 to 15 percent. A typical value of the higher heating value of LNG is approximately 50 MJ/kg or 21,500 Btu/lb.
The average salary for bookkeeper jobs is $37,000. Average bookkeeper salaries can vary greatly due to company, location, industry, experience and benefits. This salary was calculated using the average salary for all jobs with the term bookkeeper anywhere in the job listing.
Salary Range. The middle 50 percent of bookkeepers on the earnings scale make $33,315 to $43,388 per year as of March 2011, according to Salary.com. The bottom 10 percent have annual salaries of $29,040 and below, and the top 10 percent $48,286 and higher.