Laboratory 1

• Write a procedure which takes three numbers as arguments and returns the median of the values.
• Write a procedure called simple-tax which computes the amount of income tax owed based on the following formula:
  If you make $25000 or less, you owe no tax.;
  Otherwise, your tax rate is 10% on the amount over $25000
  ; For example: (Uncomment and use as test cases when you're done)
  ; (simple-tax 15000) ; => 0
  ; (simple-tax 25000) ; => 0
  ; (simple-tax 26000) ; => 100
  ; (simple-tax 50000) ; => 2500
  
• exercises 1.3, 1.4, 1.5, 1.6 in the text