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Copy and paste the following HTML code into a new document: Exercise 4 Order Books Online Book Quantity Price Basic XHTML $19.99 Intro to PHP

Copy and paste the following HTML code into a new document:

Exercise 4

Order Books Online

Write JavaScript code that is executed during form submission to calculate the cost of each book (based on quantity specified) and the overall total cost. The results should be displayed on the same page beneath the form submission button. Use any CSS at your discretion if desired.

All JavaScript code must be external. If any fields are left blank or do not contain a number, an alert box should display an appropriate error message upon form submission.

sample ouput:

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Order Books Online Book Quantity Price $19.99 Basic XHTML 1 Intro to PHP $86.00 Advanced JQuery 3 $55.00 Place Order Basic XHTML (Quantity 1): $19.99 Intro to PHP (Quantity 20: $172 Advanced JQuery (Quantity 3): $165 Final Total: $356.99

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