Biology microscope scales?

When calibrating an ocular micrometer, let's ume that you found that one ocular micrometer division is equal to 32 micrometers under low power, 13 micrometers under medium power, and 3.2 micrometers under high power. Note that these figures are NOT the same as the ones you calculated in the "using the microscope" skill. Under medium power, you measured a cell to be 15 ocular units in length. How long is the cell in reality? Give your answer in micrometers