Tax Rate default based on amount threshold in oracle fusion

How we can setup threshold for sales based on amount. we have a requirement where we have to default tax rate based on sales amount for each legal entity.

e.g. for Legal entity 1 :- If transaction amount is less then 5000 then tax rate will be 5% if amount is more then 5000 then for first 5000 tax rate will be 5% and for additional amount tax rate will be 6%

For legal entity 2 :- If transaction amount is less then 6000 then tax rate will be 6% if amount is more then 6000 then for first 6000 tax rate will be 6% and for additional amount tax rate will be 7%