AS Biology- Magnification Watch

Mell x
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Hey, I'm currently struggling on how to work with eyepiece graticule division with these two questions.

B) A slide micrometer, where 1 division equals 10 micrometres was used to calibrate an eyepiece micrometer. At a magnification of x400 it was found that 100 eyepiece divisions measured 16 slide micrometer divisions. What is the size of one eyepiece division in micrometres at this magnification?

C) A blood smear was examined at the same magnification, and the diameter of a neutrophil was found to measure 10 eyepiece divisions. What is the diameter of the neutrophil in micrometres?

Could someone explain how I would work these out please?
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