1. An indicator variable, called 'TrvlExp,' that we'll use to determine whether $30 covers your travel expenses to school each week, assuming you travel by car (transportation=1). If you do not travel by car (transportation=2, 3, or 4), we'll just assume that $30 covers your expenses. Use SAS to code the following algorithm for determining TrvlExp:
   1. If transportation = 2, 3 or 4, then TrvlExp = 1;
   2. If transportation = 1, then do the following:

- Calculate # of gallons of gas that you can purchase for $30

(gal30 = 30 / GasPrice)

- Calculate # of miles your car can travel for each gallon of gas

(MilePerGal = TankLast / TankVol)

- Calculate # miles $30 will last (mile30 = gal30*MilePerGal)

- Calculate total # round-trip miles that you drive to and from school each week

totmile = OneWay*SchTimes*2

- If mile30 >= totmile, thenTrvlExp = 1

1. Create a variable 'birthdat' (your birthday in 2005) that combines BirthM, BirthD and use 2005 as year. For example: if BirthM = 3, birthD = 9, the birthdat = 03/09/05
2. Create a variable called stature. Stature = 1 if your height is higher than the median height of the class; otherwise stature = 0.