javascript - Outputting a calculation -


I have verified this script on the w3 validator and it is not valid with errors, but when I do something within the cart The output tries to calculate. I was wondering what the problem was. 

  & lt; script type = text / javascript & gt; Function ShoppingCart () {var Karrata = 0.10; Var tax = 0; Var subtotal = 0; Var total = 0; Var quantity = document. GetElementById ("Quantity"). Values; Var price = document.getElementById ("Options"). Values; Subtotal = quantity * price; Tax = Subtotal * Taxrate; Total = subtotal + tax; Tax = tax.toFixed (2); SubType = SubTotal.toFixed (2); Total = total.toFixed (2); & Lt ;! - data back form - & gt; . Document.getElementById ('sub-totals') innerHTML = "sub-tot =" + sub-totals; document.getElementById ('totalTax') innerHTML = "Totaltax =" + tax + "(@ 10)". document.getElementById ('Total'). InnerHTML = "total =" + total; Alert ("checkotle")} & lt; / Script & gt; & Lt; / Head & gt; & Lt; Body & gt; & Lt; Script type = text / javascript & gt; & Lt; / Script & gt; & Lt; Form onsmubit = "shoppingcart ()" & gt; & Lt; H1 & gt; Shopping cart & lt; / H1> Choose option & lt; Select & gt; & Lt; Option value = "" & gt; Select & lt; / Option & gt; & Lt; Option value = "$ 20" & gt; Spin class $ 20 & lt; / Options & gt; Option value = "$ 40" & gt; "Swim lessons $ 40  gt; option value =" $ 10 "> Boxers $ 10  
 Option value =" $ 5 "& gt; Protein shake $ 5  gt; & gt; Selection & gt; Label = "session"> Session: & lt; / label & gt; & lt; input type = "text" Name = "Quantity" size = "1" id = "session"> 
  Battery 
 
     
 
 
 The elements you were trying to write do not appear in the section of HTML Your code  
 Some of them are not present at all and some have wrong cover < / P> 
 This is my guess for your estimate:  
  document  element  
  document. GetElementById ('total tax') < / code> should be  document.getElementById ('tax')   
 and  
  document. getElementById ('Total')  should be  document.getElementById ('Total')    

 































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