In the example, multiplying $6 by 25 percent gives a weighted-average CMU of $1.50 for Product A. Step 4. Add the weighted-average CMUs of each product together to give the total weighted-average contribution margin or weighted-average ratio for the company's current product mix.
Select the photographs to display the original source in another window. Links to external sites will be displayed in another window. Terrestrial planets have hard surfaces that can be re-shaped by several different processes: impact cratering, volcanism, erosion, and tectonics.
Copernicusâs model handled the basic observations: 1  Like the geocentric model, the earth was believed to be round. 2  The earth rotated, and thus the stars, sun, and planets appeared to move around the earth.  Mercury and Venus were closer to the sun than the earth and so always appeared near the sun.