I think it might be six, sorry if its wrong, but I hope its right!!
Hope this helps!!!!
love: Deku <3
Use a projector do you have one?
Given that the basket of watermelons sells for $9 before tax and the tax rate is 9%.
The tax on the basket of watermelons is given by

Therefore, the total price Tiffany pays for the basket of watermelons is $9 + $0.81 = $9.81