Question 166192
OK we are given fixed cost of 2500. Lets call total cost C and the number of animals A. We are given an additional cost of $3.00 for each test administered to an animal.

a. so to express total cost to test A animals we have
   {{{C=2500+3A}}}

b. Average cost per animal would be total cost divided by total number of animals  {{{C/A}}}

c For 10   animals we have (2500+3(10)/10= $253/animal
  For 100  animals we have (2500+3(100)/100= $28/animal
  For 1000 animals we have (2500+3(1000)/1000= $5.4/animal 

d. the avg cost per animal decreases as the amount of animals increases.

   the avg cost per animal will never go below 3--->avg cost =(2500+3A)/A
    or (2500/A)+3   so it can get close to $3/animal but never quite reachs it.
e  (2500+3A)/A=5  so 2A=2500 A=1250 animals to avg $5 in costs