I have an assignment where i have to create an expert system for a bank loan. One of the criteria is:
Loan size
No points are deducted for a £10,000 loan. Henceforth, 0.0002 points are deducted from the total score for each additional £1 of the requested loan

Does anyone know how to formulate this so that for any amount of loan inserted, the points given are according to this loan?

Please help me!!!