Cell structure: describe question

A student uses a light microscope to measure the width of a plant cell. The student has an eyepiece graticule with 50 divisions and a stage micrometer with 100 divisions per mm. The student aligns the scales and finds that 10 divisions on the eyepiece graticule coincide exactly with one division on the stage micrometer. The cell's width is measured as 8 divisions on the eyepiece graticule. Describe the steps the student should take to calculate the actual width of the cell in micrometres, including the calibration process and the conversion of units.