I need to rent a convertable car on Ict 06,2019 at 4.30 pm and drop off on Oct 7 at 4.30 pm how much it will cost me and from which location I have to pick up.

Convertible in October is not a good idea. Just call sixt and they can tell you all the info you need.

You probably don't want to rent a convertible in October in Seattle.

The cost depends on the type of vehicle, the length of your rent (here, one day), the milage you plan to do, the options you will consider (insurance? Etc). Please consider using sixt.com to make your simulation

You need to call sixt rent a car