We need a new version of a calculator as a Joomla component that can calculate the prices of our customers' book printing orders in realtime. In frontend the customer are able to enter the specifications of their book and the calculator should calculate the total cost in realtime. Then the customer should be able to order the book by uploading files and entering their contact information. The order with attached files should be sent as an email to us and an email should be sent as a confirmation to the customer, and stored in component’s back end. There are some bugs in v1.0 of this component and we would like to have some additional functions. A new version needs to be able to install as upgrade, keeping the calculations registered in the component v1.0. More information is available upon request.