One formula for different values

Hi

I would ike to write 1 formula to my workflow to get the desired result. Currently I have a table that I need to calculate the outcome based on "If". The table as follows:

Above R1 200           5%
R 601 - R1 200         10%
R 300 - R 600           15%
Less than R 300       20%

So if a contribution is above or greater than R1200 then the percent must be 5% of the contribution. If the contribution is between R601 and R1200 then the percentage must be 10% and so on.