Working through HTDP and I got to this example(below) I created a working function but I reused a function, is there a better way to assign a variable in another function so, for refernce this was the question. Exercise 4.4.2. Develop the function <code class="scheme">tax</code>, which consumes the gross pay and produces the amount of tax owed. For a gross pay of $240 or less, the tax is 0%; for over $240 and $480 or less, the tax rate is 15%; and for any pay over $480, the tax rate is 28%. My Working solution ;;; Given a gross wage determine the tax that applies taxed in bands ;;; number -> number ;;; less than 240, greater than 240 < 480, greater than 480 (define (tax_pay pay) (cond [(<= pay 240) 0] [(<= pay 480) (* pay 0.15)] [(> pay 480) (* pay 0.28)])) (define (pay hours) (* 12 hours)) ;;; Calculate netpay (pay - tax) ;;; Pay rate 12 and user input hours ;;; (pay (payrate * hours)) - (pay -(tax (pay * tax percent)) (define (netpay hours) (- (pay hours)(tax_pay (pay hours)))) Proposed solution - assign a variable to the pay calculation and reuse it, however it thinks I am redefining the function tax_pay. In embryo this is a better way to crack the egg isn't it? (define (netpay2 hours) (h (pay hours) (- h (tax_pay h))))