Correct a calculation for 1 field in our stored procedure. Ongoing work AFTER this project.

We have a stored procedures to create audit reports to verify if the amounts that the phone company has charged us are correct. There is an error in calculation for one of the fields. Once the error and the query details are understood it should not take 1 hour, to correct, but we understand the learning curve to start the work and are looking for a professionl that can do about 10hrs/week after this inicial test task. Please see the photo which has the excel spreadsheet print screen where you can see the field with the wrong value and also I have placed the correct calculation below and in the DOC that I attached. Below is the exact change that needs to be done: I = subscription , and is incorrect the formula is Formula for D = B-C D = amount charged with discount C = Discount amount B = amount charged without discount Forumula for “F” = (D-A)I = subscription , and is also incorrect Formula for D = B-C D = amount charged with discount C = Discount amount B = amount charged without discount Forumula for “F” = (D-A) F = Amount to contest of specific service (ex. 1 phone call not ALL phone calls) D = amount charged with discount A = Amount that should be charged according to contract. Please use the same algorithms to calculate services J and K J = 50 minute plan is also incorrect, use same formulas as I “subscriptions” K = 2,000 in grupo minutes is also incorrect, use same formulas as I “subscriptions” [login to view URL] and SP can be seen in the attached file.