Interpret units in formulas

Problem

Consider the formula F, equals, start fraction, N, dot, M, divided by, P, end fraction, where
  • F represents the fertility of soil,
  • N represents the amount of nutrients in the soil,
  • M represents the amount of moisture in the soil, and
  • P represents the amount of pollutants in the soil.
Select an appropriate measurement unit for fertility of soil.
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Do 4 problems