Tiffany buys a basket of watermelons on sale for \$9$9dollar sign, 9 before tax. the sales tax is 9\%9%9, percent. what is the total price tiffany pays for the basket of watermelons?

Let x be the total price of basket of watermelons including tax.

We have been given that Tiffany buys a of basket of watermelons on sale for $9. The sales tax is 9%. So our total price will be 9 plus 9% of cost of watermelons' basket ($9).

Therefore, Tiffany will pay $9.81 for the basket of watermelons.