<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;">While you got it working, you are over complicating the process. First you defined that variables, that's fine (define tax-rate .15) (define pay-rate 12) The function net-pay only needs one input, the amount of hours you are working. With the defined pay-rate and tax-rate, how would you determine net-pay of 10 hours by hand? I hope you would multiply pay-rate by hours to produce gross pay (12 * 10)=120, so 120 is the gross pay. Now how would you find the net pay of the gross pay? You could either subtract .15 from 1, or subtract gross pay*.15 from gross pay. 120*.85= 102, or 120-120*.15 =102. While auxiliary functions are a great thing to understand you don't quite need them for such a small function, you can even define the function with out defining variables. The solution you came up with just seems confusing when I look at it. You defined gross-pay as (define(gross-pay h) (* h pay-rate)) You are using gross in net-pay as an argument which isn't really something you need to do right now. Everytime you want to check a number you need to type (netpay(gross x)taxrate) why not just develop it so you can type (net-pay x) and have it produce the net-pay? Try doing it without using an auxiliary function and the ONLY argument as h (define(netpay h) (tax-rate payrate h..)  Those should be the only things used in your program. </td></tr></table>