trend percentage= (analysis period amount / base period amount) x 100.
http://wiki.answers.com/Q/How_do_you_calculate_tre...

1. Subtract the size at the end of the specified period from the size at the beginning of the specified period. For example, if you were finding the growth trend for a city for the
http://www.ehow.com/how_7471835_calculategrowtht...

1. Add the sales volume from each employee or each location to find the total sales. For example, if the first sales rep sold 1,900 units, the second sold 3,100 units and the third
http://www.ehow.com/how_12036430_calculatepercent...

1. Determine the country's net imports for a specified period of time, usually one year. The U.S. Census Bureau will periodically release these statistics on its website. As an example
http://www.ehow.com/how_8766775_calculatebalance...
