Getting Total Price

I am trying to add the price and shipping to equal the total price and display it in a table(receipt) I am able to get the price and shipping and handling to write to the page, but not sure how to add them together to get the total price:

The below code gives me $40.00$ 3.00 I want it to show as $43.00 ($40 + $3.00)if they ordered 500 business cards or $75.00 ($72 + $3.00)if they ordered 100 business cards.

<%
quantity = Request.QueryString("quantity")
If (quantity = "500") Then
price = "$40.00"
Else
price = "$72.00"
End If
%>
<%
shipping = "$ 3.00"
total = (price + shipping)
%>