Find the total number of red blood cells, white blood cells, and platelets in 1mm3 of blood. calculate what percentage of the total each type is.

A 1 mm³ of blood contains 4 - 6 million of erythrocytes or red blood cells, 5 - 10 thousand leukocytes or white blood cells, and 150 - 400 thousand of platelets. Using the lower approximates of the cells to total number of cells will be 4.155 million cells in 1 cubic mm.

Percentage of red blood cells will be 4 / 4.155 = 96.27 %

Percentage of white blood cells = 0.005/4.155 = 0.12 %

Percentage of the platelets = 0.15/4.155 = 3.61%