I am having trouble figuring this out... I am trying to write an SQL query to subtract 2 values from this table:

`RateTable:`

```
RecordID | Policy | Benefit | CBBR  | IBBR 
---------+--------+---------+-------+-------
   1     | 12345  |   A     | $1.34 | $5.64 
   2     | 12345  |   B     | $4.56 | $0.56 
   3     | 12345  |   C     | $5.67 | $3.32 
   4     | 54321  |   A     | $2.57 | $6.24 
   5     | 34512  |   A     | $1.76 | $3.32 
   6     | 34512  |   A     | $4.56 | $1.34 

```

I need to create a query that will return the result from the value in CBBR where Policy = 12345 and benefit = A then subtract the value in IBBR where Policy = 12345 and benefit = B ($1.34 - 0.56)

Any ideas?