Shipping and Tax issues

I have two sites I have sety up. one is and soon to be both are located in Florida, US.

For some reason when I add more then one product to my cart, the shipping cost increases along with the quantity. ex: If I order one shirt and the shipping is $6.00. shipping will be $6.00, but if I add 30 shirts, the shipping is $180… that is not right.

Also the taxes.

When someone from Florida purchases from my site, I have to charge Florida sales tax, unless the buyer is from out of state. then sales taxes are not applied. How can you fix this issue. or If I am mising somthing from the instruction … please let me know

the shirt issue, sounds like you put 6$ on the shipping cost of the shirt. set it to zero.