Suppose that an island in MacArthur-Wilson equilibrium supports 75 species, out of a source pool of 100 species

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Suppose that an island in MacArthur-Wilson equilibrium supports 75 species, out of a source pool of 100 species. The maximum extinction rate (E) is 10 extinctions per year. a. Using the equation Seq = (I * P)/(I + E), calculate the maximum immigration rate (I) [units = species/year]. b. If I is doubled, what is the new species equilibrium [units = species]? Using the equation Teq = (I*E)/(I + E), what is the new turnover rate [units = species/year]?