The mitotic index is a measure of the mitotic activity of a population of cells. It is calculated as the percentage of cells in mitosis at any one time. Assume that upon examining a sample of 1000 cells, you find 30 cells in prophase, 20 in prometaphase, 20 in metaphase, 10 in anaphase, 20 in telophase, and 900 in interphase. Of those in interphase, 400 are found (by staining the cells with a DNA-specific stain) to have XX amount of DNA, 200 to have 2X2X, and 300 cells to be somewhere in between. Autoradiographic analysis indicates that the G2G2 phase lasted 4 hours. Part A What is the mitotic index for this population of cells