I am trying to build an ecommerce calulator and need Perl to solve for X or Y.

This is a calculator which will help freelancers determine what to charge on sites like RentACoder and Kasamba where the sites get a certain fee.

I want to set it up so you input the number you want AFTER they take their fees. For an example, if I wanted to charge $100 for graphic design the script would determine I would need to charge say $112.70 or whatever.

Pretty much it's to calculate their percentage into the price want AFTER their fees. You don't need to look up their fees and do it for me, I just need to know how I'd do something like this.

In reply to solving for x by Anonymous Monk

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