Use the Following to Answer Questions

Use the following to answer questions :
At low densities and in the absence of any other beetle species,the population of a strain of the flour beetle called Tribolium castaneum grows at a per capita rate of 0.25 per week.In controlled lab conditions,this growth rate is reduced by 0.01 for every 100 individuals.The addition of a related beetle,Tribolium freemani,further reduces the per capita growth rate of T.castaneum by 0.03 for every 100 T.freemani individuals.
-If there are 1,000 T.castaneum and 400 T.freemani individuals,what is the per capita growth rate per week of the T.castaneum population?

A) -0.02
B) 0.03
C) 0.11
D) 0.15
E) 0.34