Classify Output Raster as percentage in arcGIS

I have water supply and water demand rasters.They are both of the same cell size and spatial reference.

I need the ratio of water use to water demand.

Then I want to classify this output in the following way for each raster cell:

If water demand value is greater than water supply value by 40% I assign it a value of 1

If water demand value is 20 - 40% greater than water supply value, I assign it to class of 2

If water demand less than or equal to 20% greater than water supply, I assign it to 3.

Please I'd appreciate help on how to do all of this.

Thank you.