Although the U.S. Bureau of Labor Statistics (BLS) does not provide information specific to the field of global marketing, the BLS did project that the employment of marketing managers will likely grow by about 12% between 2012 and 2022, a rate consistent with the average predicted for all occupations.
Divide the height of the staircase in inches by the intended rise of each step, also in inches, to assist in determining the stair stringer length. The riser height is up to you, though most building codes will not allow a height larger than 7 3/4 inches.
For the example staircase, take the total rise of 102 inches divided by 13 risers to equal 7.85 inches, rounded to 7 7/8 inches for each riser. Next calculate the run of the staircase to find the stringer length. Multiply the 12 treads by the minimum tread depth of 9 inches to arrive at 108 inches for the staircase run.