Question: What is the value of 

(cond
  [(<= n 1000) .040]
  [(<= n 5000) .045]
  [(<= n 10000) .055]
  [(> n 10000) .060])

when n is:
(a) 500   -> 0.040 
(b) 2800  -> 0.045
(c) 15000 -> 0.060