Transact SQL :: Query To Compare Current Price With That Of Previous Value Of Item

There are two tables testmaster and testdetail. If the value of Price for a particular ID in testdetail is more than the threshold value defined in testmaster, the output should have a new column with value as 'High Value', if the value is less than the threshold the new output should be 'Low Value' other wise 'Ignore'

Example: for ID=3, threshold is defined as 40% in testmaster table, but on 11/12/2015 the new price is 100 which 100% more than the previous value, so the status is High Value as shown below.

ID Date
Price Status
1 11/12/2015 100 Low Value

2 11/12/2015 160 Ignore
3 11/12/2015 100 High Value

create table testmaster
(
ID int,
Threshold int
)
create table testdetail
(
ID int,
Date varchar(20),
Price float
)

[Code] ...