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A simple calculation tool with PHP

This project received 34 bids from talented freelancers with an average bid price of £139 GBP.

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Skills Required
Project Budget
£20 - £250 GBP
Total Bids
34
Project Description

Hi all,

I have a Google Doc spreadsheet where I make some ROI (return of investment) calculations. Simply I put a few values on the right pane and some other values are calculated (the four arithmetical operations) and displayed on the right pane.

Please see the attachment.

I need a PHP page that does the same thing. I'll publish it on my website.

I need a simple but elegant design. Would be great if you could show some previous work & design.

I need this to be done in a couple of days.

Source code should be clean and easy to understand (constant definitions etc) so my devs can change it later.

Thanks

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