tax rate question

With cs-cart version 2.2.1

I was playng with the tax rate an was trying to create a flat addon of $10.00 to all orders. So I thought if I used the tax type of absolute I would get this. It seems that absolute is percentage based on each $100 dollars.



Sample I was using was Rate Value 0.500 Absolute

if order was $113 it showed tax in cart as $10

if order was $226 it showed tax in cart as $20

if order was $339 it showed tax in cart as $30



Is this the way absolute is suppose to work?



Thanks,

Dave